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T形截面振子的驰振特性试验研究 预览
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作者 燕翔 练继建 +3 位作者 刘昉 任泉超 张军 邵楠 《振动工程学报》 EI CSCD 北大核心 2019年第3期431-438,共8页
T形振子的流致振动响应表现出了"非自限制"特性,随着流速的增大出现驰振现象,振动增强,有利于能量利用.但T形振子在复杂环境条件及自身截面变化条件下的研究尚未开展.基于此,进行了T形振子的试验研究,旨在探索其流致振动完整... T形振子的流致振动响应表现出了"非自限制"特性,随着流速的增大出现驰振现象,振动增强,有利于能量利用.但T形振子在复杂环境条件及自身截面变化条件下的研究尚未开展.基于此,进行了T形振子的试验研究,旨在探索其流致振动完整响应规律及在不同截面高宽比下的响应差异,具体结论如下:与三棱柱振子类似,T形振子也存在硬、软驰振现象,阻尼比较大时,出现硬驰振现象,而阻尼比较小时出现软驰振现象;软驰振响应中,振子的驰振具有自激发特性,由涡激振动激发而成;硬驰振响应中,振子需外力才可激发驰振;随着截面高宽比的增大,振动响应逐渐由硬驰振转化为软驰振,且驰振分支中振幅与频率均有所降低. 展开更多
关键词 流致振动 涡激振动 T形截面 驰振 截面高宽比
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AutoCAD格式图件转换为MapGIS格式图件的方法 预览
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作者 张旭 《化工矿产地质》 CAS 2019年第1期46-49,共4页
AutoCAD格式图件保存为DXF的交换格式图件,利用section软件读取DXF文件,并分层保存,通过综合整饰,得到转换后未添加坐标系统的MapGIS格式图件,可利用MapGIS生成标准图框的方式,为转换后的图件添加坐标系统section和MapGIS两款软件配合使... AutoCAD格式图件保存为DXF的交换格式图件,利用section软件读取DXF文件,并分层保存,通过综合整饰,得到转换后未添加坐标系统的MapGIS格式图件,可利用MapGIS生成标准图框的方式,为转换后的图件添加坐标系统section和MapGIS两款软件配合使用,可将AutoCAD格式图件较好的、快速转换为MapGIS格式的图件。 展开更多
关键词 AUTOCAD MAPGIS SECTION 转换
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Section 在“矿山测绘”资源储量估算中的应用探讨 预览
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作者 刘川 《世界有色金属》 2019年第5期27-27,29共2页
“矿山测绘”能为测绘工程行业提供有效依据,结合矿山测量、采矿企业的技术标准等,可以为地下工程行业、隧道工程提供有效指导,促使其工作意义的发挥。对矿产资源储量进行估算,是“矿山测绘”以及整个测绘技术中最为关键的部分。尤其是... “矿山测绘”能为测绘工程行业提供有效依据,结合矿山测量、采矿企业的技术标准等,可以为地下工程行业、隧道工程提供有效指导,促使其工作意义的发挥。对矿产资源储量进行估算,是“矿山测绘”以及整个测绘技术中最为关键的部分。尤其是在现代科学技术水平逐渐提升下,Section成为矿产资源储量估算的主要手段。在本文中,具体探究Section在“矿山测绘”资源储量估算中的应用。 展开更多
关键词 SECTION “矿山测绘” 资源 储量 估算
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In-medium NN→NΔ cross section and its dependence on effective Lagrange parameters in isospin-asymmetric nuclear matter
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作者 崔莹 张英逊 李祝霞 《中国物理C:英文版》 SCIE CAS CSCD 2019年第2期115-124,共10页
The in-medium NN→N△ cross sections and its differential cross sections in isospin asymmetric nuclear medium are investigated in the framework of the one-boson exchange model by including isovector mesons, i.e., δan... The in-medium NN→N△ cross sections and its differential cross sections in isospin asymmetric nuclear medium are investigated in the framework of the one-boson exchange model by including isovector mesons, i.e., δand p mesons. Our results show that the in-medium NN→N△ cross sections are suppressed when the density increases, and the differential cross sections become isotropic with an increase in the density around the △ threshold energy. The isospin splitting on the medium correction factor, R =σNN→N△*/σNN→N△free is observed for different channels of NN→N△, especially around the threshold energy for all the effective Lagrangian parameters. By analyzing the selected effective Lagrangian parameters, our results show that the larger effective mass is, the weaker medium correction R is. 展开更多
关键词 in-medium NN→NΔcross SECTION isospin-asymmetric nuclear matter Lagrangian PARAMETERS differential CROSS SECTION
多波束测深系统在水下抛石验收中的应用 预览
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作者 李维奇 王小龙 卢禹成 《港工技术》 2019年第1期108-111,共4页
本文利用多波束测深系统对长江口岸直水道整治工程进行水下抛石验收,利用多波束技术覆盖整个施工区平面的全覆盖测量方式,通过水深格网结合三维模式展示,真实反映了抛石增厚值、坝顶高度、宽度、及边坡比等指标,完全反映了施工区抛石效... 本文利用多波束测深系统对长江口岸直水道整治工程进行水下抛石验收,利用多波束技术覆盖整个施工区平面的全覆盖测量方式,通过水深格网结合三维模式展示,真实反映了抛石增厚值、坝顶高度、宽度、及边坡比等指标,完全反映了施工区抛石效果,使结果具有唯一性。本文技术成果方便了抛石工艺的优化,为水下抛石重大工程的验收提供了一个新的思路,可以极大提高作业效率以及节约成本,具有广泛的应用价值。 展开更多
关键词 多波束测深系统 断面 格网 三维 水道整治
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CFD simulation of the effects of a suspension section on the hydrodynamics of a circulating fluidized bed
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作者 Cenfan Liu Nan Zhang Wei Wang 《中国颗粒学报:英文版》 SCIE EI CAS CSCD 2019年第2期1-8,共8页
Gas-solid two-phase flow in a circulating fluidized bed (CFB) is affected by operating conditions (e.g., superficial gas velocity, solids inventory), material properties and geometric factors, such as the entry and ex... Gas-solid two-phase flow in a circulating fluidized bed (CFB) is affected by operating conditions (e.g., superficial gas velocity, solids inventory), material properties and geometric factors, such as the entry and exit configuration. In particular, the suspension section, which is located between the riser bottom and the solids recycle inlet, affects the hydrodynamics in the riser significantly. However, the suspension section has received less attention compared with other geometric factors. Most computational fluid dynamics (CFD) simulations, especially two-dimensional simulations do not take this factor into account. We performed three-dimensional, full-loop CFD simulations with a drag coefficient that was determined by the energy-minimization multi-scale model, and investigated the flow behavior of two CFBs with different suspension-section lengths. The simulation resuits revealed that the axial profiles of voidage in the riser with a longer suspension section are more likely S-shaped, whereas those with shorter suspension sections decay exponentially. The dependences of solids flux on solids inventory differ in the two CFBs. A shorter suspension section may result in a smooth transition from dilute to dense transport without intermediate accumulative choki-ng, whereas a Ion ger suspe nsion section may lead to a choking transition. These simulation results are qualitatively consistent with the flow behaviors described in literature. 展开更多
关键词 Computational fluid dynamics FLUIDIZATION MESO-SCALE Energy-minimization MULTI-SCALE SUSPENSION SECTION
“Exploring petroleum inside source kitchen”: Connotation and prospects of source rock oil and gas 预览
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作者 YANG Zhi ZOU Caineng 《石油勘探与开发:英文版》 2019年第1期181-193,共13页
Based on the transitional background of the global energy structure, exploration and development of unconventional oil and gas, and investigation of key basins, the unconventional oil and gas resources are divided int... Based on the transitional background of the global energy structure, exploration and development of unconventional oil and gas, and investigation of key basins, the unconventional oil and gas resources are divided into three types: source rock oil and gas, tight oil and gas, and retention and accumulated oil and gas. Source rock oil and gas resources are the global strategic supplies of oil and gas, the key resource components in the second 150-year life cycle of the future petroleum industry, and the primary targets for “exploring petroleum inside source kitchen”. The geological connotation of source rock oil and gas was proposed, and the models of source rock oil and gas generation, expulsion and accumulation were built, and five source rock oil and gas generation sections were identified, which may determine the actual resource potential under available technical conditions. The formation mechanism of the “sweet sections” was investigated, that is, shale oil is mainly accumulated in the shale section that is close to the oil generation section and has higher porosity and permeability, while the “sweet sections” of coal-bed methane(CBM) and shale gas have self-contained source and reservoir and they are absorbed in coal seams or retained in the organic-rich black shale section, so evaluation and selection of good 'sweet areas(sections)' is the key to “exploring petroleum inside source kitchen”. Source rock oil and gas resources have a great potential and will experience a substantial growth for over ten world-class large “coexistence basins” of conventional-unconventional oil and gas in the future following North America, and also will be the primary contributor to oil stable development and the growth point of natural gas production in China, with expected contribution of 15% and 30% to oil and gas, respectively, in 2030. Challenges in source rock oil and gas development should be paid more attention to, theoretical innovation is strongly recommended, and a development pilot zone can be est 展开更多
关键词 SOURCE rock OIL and GAS SHALE GAS SHALE OIL coal-bed methane SWEET section SWEET area SOURCE control theory man-made OIL and GAS reservoir UNCONVENTIONAL OIL and GAS revolution large“coexistence basins”of conventional-unconventional OIL and GAS
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Geophysical criterion of pre-outburst coal outsqueezing from the face space into the working 预览
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作者 Alexander Shadrin Yuliya Diyuk 《矿业科学技术学报:英文版》 CSCD 2019年第3期499-506,共8页
The initial process of coal and gas sudden outburst is studied in the article when under the influence of rock and gas pressure the part of a coal seam layer(a coal section)is squeezed out from the mouth of the future... The initial process of coal and gas sudden outburst is studied in the article when under the influence of rock and gas pressure the part of a coal seam layer(a coal section)is squeezed out from the mouth of the future outburst cavity in a jump-like manner into the working.Geo-mechanical criterion for a part of a coal seam layer outsqueezing in the form of the relation of active(squeezing out)and passive(preventing the outsqueezing)forces is defined in the article.Based on it,the geophysical criterion is defined by expressing basic physical parameters through geo-physical ones:the current stress is defined by spectral-acoustic method through the ratio of high frequency and low-frequency components of an acoustic signal,which is generated into a face working space by the mining equipment operating in the face;in-situ gas pressure is defined by gas analytical method by the concentration of methane in the atmosphere of the working;the strength of the most broken coal layer is defined by a strength measuring device(a device for measuring the depth of a steal cone punched into the coal by a spring mechanism).This paper studies the influence of acoustic,strength and filtrating and collecting properties of a face working space on the limit value of an obtained geophysical criterion of pre-outburst squeezing of a coal‘‘plug”out of the mouth of the future outburst cavity into the working. 展开更多
关键词 Block-like structure CRITERION of a COAL section outsqueezing Spectral-acoustic method Stress condition COAL strength property IN-SITU GAS pressure Aero and GAS control equipment METHANE concentration
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π截面铝合金型材拉弯成形工艺数值模拟研究
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作者 卜晓珍 翟华 +2 位作者 周丽华 俞春生 赵坤民 《塑性工程学报》 CAS CSCD 北大核心 2019年第2期151-161,共11页
针对A7075-T6型材结构件,利用ABAQUS软件建立π型截面型材拉弯成形有限元模型,对该铝合金型材结构件拉弯成形进行数值模拟,并分析预拉量、补拉量、弯曲半径及摩擦系数的变化对回弹的影响。结果表明:预拉量、补拉量、弯曲半径和摩系数都... 针对A7075-T6型材结构件,利用ABAQUS软件建立π型截面型材拉弯成形有限元模型,对该铝合金型材结构件拉弯成形进行数值模拟,并分析预拉量、补拉量、弯曲半径及摩擦系数的变化对回弹的影响。结果表明:预拉量、补拉量、弯曲半径和摩系数都会影响回弹量,在相对应的变化范围内,回弹随着预拉量、补拉量的增大有明显减小的趋势,而回弹量与弯曲半径和摩擦系数均呈正相关。其中对回弹量的变化影响较为明显的为拉伸量;当预拉量为1%,补拉量为2%,摩擦系数为0. 08,弯曲半径为200 mm时,回弹最小。 展开更多
关键词 铝合金型材 π截面 拉弯成形 回弹
Reaction mechanism of D + ND→N + D2 and its state-to-state quantum dynamics
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作者 许婷 赵娟 +1 位作者 王宪龙 孟庆田 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第2期173-178,共6页
The quantum state-to-state calculations of the D + ND→N + D2 reaction are performed on a potential energy surface of 4 A’’ state. The state-resolved integral and differential cross sections and product state distri... The quantum state-to-state calculations of the D + ND→N + D2 reaction are performed on a potential energy surface of 4 A’’ state. The state-resolved integral and differential cross sections and product state distributions are calculated and discussed. It is found that the rotational distribution, rather than the vibrational distribution, of the product has an obvious inversion. Due to the fact that it is a small-impact-parameter collision, its product D2 is mainly dominated by rebound mechanism, which can lead to backward scattering at low collision energy. As the collision energy increases, the forward scattering and sideward scattering begin to appear. In addition, the backward collision is also found to happen at high collision energy, through which we can know that both the rebound mechanism and stripping mechanism exist at high collision energy. 展开更多
关键词 state-to-state quantum dynamics TIME-DEPENDENT wave PACKET D+ND differential cross section
Quantum photodetachment of hydrogen negative ion in a harmonic potential subjected to static electric field
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作者 Azmat Iqbal Kiran Humayun +4 位作者 Sana Maqsood Saba Jawaid Afaq Ahmad Amin Ur Rahman Bakht Amin Bacha 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第2期179-184,共6页
Photodetachment of negative ions has attracted immense interest owing to its fundamental nature and practical implications with regard to technology. In this study, we explore the quantum dynamics of the photodetachme... Photodetachment of negative ions has attracted immense interest owing to its fundamental nature and practical implications with regard to technology. In this study, we explore the quantum dynamics of the photodetachment cross section of negative ion of hydrogen H-in the perturbed one dimensional linear harmonic potential via static electric field. To this end,the quantum formula for total photodetachment cross section of the H-ion is derived by calculating the dipole matrix element in spherical coordinates. In order to obtain the detached electron wave function, we have solved the time-independent Schr¨odinger wave equation for the perturbed Hamiltonian of the harmonic oscillator in momentum representation. To acquire the corresponding normalized final state detached electron wave function in momentum space, we have employed an approach analogous to the WKB(Wenzel–Kramers–Brillouin) approximation. The resulting analytical formula of total photodetachment cross section depicts interesting oscillator structure that varies considerably with incident-photon energy,oscillator potential frequency, and electric field strength as elucidated by the numerical results. The current problem having close analogy with the Stark effect in charged harmonic oscillator may have potential implications in atomic and molecular physics and quantum optics. 展开更多
关键词 PHOTODETACHMENT cross section harmonic OSCILLATOR potential STARK effect time-independent Schr?dinger equation WKB approximation
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中厚煤层断面巷道围岩优化支护方案的设计 预览
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作者 关羽 《机械管理开发》 2019年第5期21-22,26共3页
以某煤矿的4-4巷道断面为研究对象,结合相关参数设计及工程的经验,完成了对4-4断面支护方案的最优化设计,并对设计结果进行了校核。为今后该煤矿巷道其他断面的最优支护方案设计奠定了基础。
关键词 断面 巷道 支护 参数 数值模拟
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Influence of Cross-Sectional Flow Area of Annular Volute Casing on Transient Characteristics of Ceramic Centrifugal Pump
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作者 Yi Tao Shouqi Yuan +1 位作者 Jianrui Liu Fan Zhang 《中国机械工程学报:英文版》 SCIE EI CAS CSCD 2019年第1期161-173,共13页
The annular volute is typically used in a slurry pump to reduce the collisions between solid particles and the volute tongue and to achieve a better resistance to blocking. However, only limited studies regarding annu... The annular volute is typically used in a slurry pump to reduce the collisions between solid particles and the volute tongue and to achieve a better resistance to blocking. However, only limited studies regarding annular volutes are available, and there is no systematic design method for annular volutes. In this study, the influence of volute casing cross-sectional flow area on the hydraulic loss, pressure pulsations, and radial force under varying working conditions in a centrifugal ceramic pump are discussed in detail. Experimental tests were conducted to validate the numerical results. The results indicated that, when the volute casing flow area increases, the hydraulic performance decreases marginally under the rated working conditions, but increases at the o-design points, specifically under large flow condition. However, the volute casing with a larger flow area has a wider high-e ciency region. In addition, the increase in the volute casing flow area will decrease the pressure pulsations in the volute, regardless of the working condition, and decrease the radial force on the shaft, therefore, providing an improved pump operational stability. It is anticipated that this study will be of benefit during the design of annular volutes. 展开更多
关键词 ANNULAR VOLUTE Centrifugal pump Cross section Transient characteristics Pressure PULSATION Radial force
Ediacaran integrative stratigraphy and timescale of China
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作者 Chuanming ZHOU Xunlai YUAN +2 位作者 Shuhai XIAO Zhe CHEN Hong HUA 《中国科学:地球科学英文版》 SCIE EI CAS CSCD 2019年第1期7-24,共18页
Ediacaran successions occur widely in various depositional facies in South China and yield a series of fossil Lagerst?tten, providing a complete fossil record for the evolution of marine ecosystems after the terminal ... Ediacaran successions occur widely in various depositional facies in South China and yield a series of fossil Lagerst?tten, providing a complete fossil record for the evolution of marine ecosystems after the terminal Cryogenian global glaciation. Carbonate-dominated Ediacaran successions in shallow water facies in South China record a nearly complete δ13C profile that may reflect variations of marine carbon isotopic composition during the Ediacaran Period. The Ediacaran fossils andδ13C profiles from South China permit stratigraphic correlation and subdivision of the Ediacaran strata. Based on biostratigraphic, chemostratigraphic, and geochronometric data from the Ediacaran successions in South China, we propose that the Ediacaran System in China can be subdivided into two series, with three stages in each series. The lower series is characterized by acanthomorphic acritarchs and the upper series by Ediacara-type macrofossils, and the two series are separated by the declining limb of a pronounced δ13C negative excursion(EN3) in the upper Doushantuo Formation. The basal boundary of Stage1 is the same as the basal boundary of Ediacaran System, which has been defined at the base of the cap carbonate unit. Stage 2 represents the first radiation of Ediacaran microscopic organisms, with δ13C feature representing by positive values(EP1). The base of the Stage 2 is placed at the first appearance level of a spiny acritarch species. Stage 3 is characterized by the occurrence of more diverse acritarchs and δ13C feature EP2, with its basal boundary defined by a δ13C negative excursion(EN2) occurring in the middle Doushantuo Formation. The basal boundary of Stage 4 is the same as the upper series. Stage 5 is marked by the occurrence of macrfossils of Miaohe biota, and its lower boundary can be placed at the level where δ13C values transition from positive to negative in MNE, or the first appearance level of macrofossils of the Miaohe biota. Stage 6 is characterized by the occurrences of Ediacara-type Shibantan biota and 展开更多
关键词 EDIACARAN BIOSTRATIGRAPHY CHEMOSTRATIGRAPHY STRATOTYPE section South China
3D打印路径规划对FDM打印质量研究 预览
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作者 熊运星 钱明杰 《江苏科技信息》 2019年第5期50-52,共3页
文章通过对两款切片软件(Cura和Simplify3D)的工艺路径规划研究,发现虽然两者有不同的填充方式,但均采用了复合填充的方式,能够融合往复直线填充和根据边界曲线的偏置填充方式,而且从外到内的填充打印使模型得到更好的表面质量,同时能... 文章通过对两款切片软件(Cura和Simplify3D)的工艺路径规划研究,发现虽然两者有不同的填充方式,但均采用了复合填充的方式,能够融合往复直线填充和根据边界曲线的偏置填充方式,而且从外到内的填充打印使模型得到更好的表面质量,同时能够降低次品率和常见的台阶效应及拉丝现象。研究表明,优化后的工艺参数有助于提升产品的表面质量和节省打印时间。 展开更多
关键词 切片 熔融沉积成型 台阶效应
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Experimental Investigation of the Mg–Zn–Zr Isothermal Section at 400℃
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作者 Yong-Peng Liang Shu-Hong Liu +1 位作者 Kai Xu Yong Du 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第4期426-432,共7页
Mg-Zn-Zr series Mg alloys(ZK) are one of the most important commercial Mg alloys due to their good comprehensive mechanical properties. The phase equilibria of the Mg-Zn-Zr system at 400℃ covering the overall composi... Mg-Zn-Zr series Mg alloys(ZK) are one of the most important commercial Mg alloys due to their good comprehensive mechanical properties. The phase equilibria of the Mg-Zn-Zr system at 400℃ covering the overall composition range were investigated by X-ray diffraction and electron probe microanalyses on thirteen ternary alloys. Three ternary compounds,τ1,τ2 and τ3, were detected to be thermodynamically stable at 400 ℃, and their homogeneity range was determined to be Mg(7-17)Zn(80-88)Zr(4-6), Mg(15-22)Zn(66-65)Zr(9-16) and Mg9 Zn68Zr23(in at.%), respectively. Eight three-phase regions and four two-phase regions were observed. The maximum solubility of Mg in Zn22 Zr, Zn39 Zr5 and Zn3 Zr phases was measured to be 0.52, 0.37 and 0.99 at.%, respectively, while the solubility of Zr in MgZn2 and Mg2 Zn3 phases is negligible. The isothermal section of the Mg-Zn-Zr system at 400 ℃ was then constructed based on the present experimental data. 展开更多
关键词 Mg–Zn–Zr ISOTHERMAL section Phase EQUILIBRIA TERNARY compounds
淠史杭灌区水资源配置与调度实践 预览
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作者 朱红 《中国水利》 2019年第3期16-18,共3页
安徽省淠史杭灌区自建成运行以来,建立形成了一套符合灌区水资源特点、以“统一调度、计划供水、总量控制、综合利用”为主要特征的水资源配置与供水调度体系,取得了明显的灌溉供水和抗旱减灾效益,为区域经济社会发展、灌区粮食稳产、... 安徽省淠史杭灌区自建成运行以来,建立形成了一套符合灌区水资源特点、以“统一调度、计划供水、总量控制、综合利用”为主要特征的水资源配置与供水调度体系,取得了明显的灌溉供水和抗旱减灾效益,为区域经济社会发展、灌区粮食稳产、城镇居民生活、生态环境改善等提供了安全可靠的水资源保障。 展开更多
关键词 淠史杭灌区 水资源配置 供水调度 成效
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上海崇明地区河道生态治理初探 预览
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作者 李念斌 黄蒙 许瑞东 《中国水利》 2019年第3期33-34,共2页
推进崇明世界级生态岛建设,需结合实际,因地制宜制定方案,不断探索新理念、新工艺、新材料,构建良好的水环境。指出了河道生态治理的误区,结合崇明地区河道现状,结合实例,从平面布局、断面设计、护岸结构等方面对生态河道治理中应当遵... 推进崇明世界级生态岛建设,需结合实际,因地制宜制定方案,不断探索新理念、新工艺、新材料,构建良好的水环境。指出了河道生态治理的误区,结合崇明地区河道现状,结合实例,从平面布局、断面设计、护岸结构等方面对生态河道治理中应当遵循的设计思路进行了探讨。通过河道疏浚、护岸建设以及绿化改造,打造自然生态景观,为崇明区生态河道治理提供参考。 展开更多
关键词 崇明 生态岛 平面 断面 护岸 生态河道
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Unit 5 What are the shirts made of? Section A 3a-3c教学设计(一) 预览
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作者 孙艺凝 《黑龙江教育:中学版》 2019年第3期6-8,共3页
(此课选自义务教育课程标准实验教科书《英语》(新目标)Go for it.九年级(全一册))一、设计理念:本节课的教学内容是一节完整的阅读板块,采用单词讲解,读前预测,读中利用寻读和细读的阅读策略提取文章关键信息,读后利用思维导图总结全... (此课选自义务教育课程标准实验教科书《英语》(新目标)Go for it.九年级(全一册))一、设计理念:本节课的教学内容是一节完整的阅读板块,采用单词讲解,读前预测,读中利用寻读和细读的阅读策略提取文章关键信息,读后利用思维导图总结全文信息,然后讲解文章难句的设计思路,培养学生的分析能力和阅读技能。 展开更多
关键词 阅读策略 SECTION A 3a-3c 整体阅读 杨老师 教学设计 文章篇幅 词汇教学 输出任务 UNIT 5 WHAT ARE the SHIRTS MADE of 阅读教学
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Unit 5 What are the shirts made of? Section A 3a-3c教学设计(二) 预览
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作者 杨柳 《黑龙江教育:中学版》 2019年第3期8-10,共3页
一、教学目标1.语言知识目标:A.Newwords:product,France,local,brand,avoid,handbag,handbag,mobile,everyday B.Newphrases:nomatter,mobilephone,avoiddoing2.语言技能目标:A.Get the main idea of the passage by skimming.B.Read c... 一、教学目标1.语言知识目标:A.Newwords:product,France,local,brand,avoid,handbag,handbag,mobile,everyday B.Newphrases:nomatter,mobilephone,avoiddoing2.语言技能目标:A.Get the main idea of the passage by skimming.B.Read carefully to get the meaning of eachparagraph.C.To enable students understand the use of pronouns by reading the sentences before or after them. 展开更多
关键词 Activity UNIT 5 WHAT ARE the SHIRTS MADE of SECTION A 3a-3c
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