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2009级机自专业英语试题b卷

重庆大学试卷

教务处 07 版

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重庆大学 2009 级机自《专业外语》课程试卷
2011 ~2012
姓名

学年 第 1 学期

8. One of the important considerations in material selection is their physical properties (that is, density, melting point, specific heat, thermal conductivity, thermal expansion, and corrosion resistance).

开课学院: 机械工程学院 课程号: 11007420 考试日期:

二、 段落翻译(15 分/每小题,共 60 分)
分钟 总 分
1. A material is said to be elastic if it returns to its original, unloaded dimensions when load is removed. A particular form of elasticity which applies to a large range of engineering material, at least over part of their load range, produces deformations which are proportional to the loads producing them. Since loads are proportional to the stress they produce and deformations are proportional to the strains, this also implies that, whilst material are elastic, stress is proportional to strain. Hooke’s law therefore states that

命 题 人 : 庞 晓 平 组 题 人 : 审 题 人 : 董 小 闵 命 题 时 间 :
2011

考试方式:


考试时间: 120 二 三 四 五 六 七 八 九 十

题 号 得 分



公平竞争、诚实守信、严肃考纪、拒绝作弊

学号

stress (? ) ? strain(? )

一、 单句翻译(5 分/每小题,共 40 分)
1. Angular contact ball bearings are available with a choice of preloading magnitude, typically designated as light, medium, and heavy. 2. Substitution of materials for the sake of weight saving and economy is a major factor in the design both of advanced equipment and machinery and of consumer products, such as automobiles. 3. The function of the flutes (排屑槽)is to provide outlet passages for the chips generated during the drilling operation and also to allow lubricants and coolants to reach the cutting edges and the surface being machined. 4. Then as metal is slashed away with tremendous force at varying depth, the machine must guide the tool along a firm course and hold the workpiece steady so that neither deviates from the other by more than 12.5 μ m — and this is not close work.. 5. the temperature rise in a workpiece resulting from machining operations is a function of the work done and of the specific heat of the workpiece material. 6. The mechanical vibrations dealt with are either excited by steady harmonic forces (i.e .obeying sine and cosine laws in cases of forced vibrations) or, after an initial disturbance, by no external force apart from gravitational force called weight (i.e. in cases of natural or free vibrations). 7. The principles of mechanics show that deflection of a machine member is inversely proportional to the cube of its depth in the direction of an applied load. For that reason, a machine tool section is deep in the direction of the main force and heavily ribbed and wide to take other forces and moments. 2.A link(连杆)is one of the rigid bodies or members joined together to form a kinematic chain. The term rigid link, or sometimes simply link, is an idealization used in the study of mechanisms that does not consider small deflections due to strains in machine members. A perfectly rigid or inextensible link can exist only as a textbook type of model of a real machine member. 3.To determine a potential supplier’s level of experience with your prospective equipment, request a list of customers who have purchased similar machines. This list will reflect repeat orders, which is a good indication of customer satisfaction. Be extremely cautious if the equipment being proposed to you is one of the first to be built by a particular manufacturer. You could end up debugging the equipment at the expense of your production quotas. 4.Each of the cutting edges of a milling cutter acts as an individual single-point cutter when it engages with the workpiece metal. Therefore, each of those cutting edges has appropriate rake and relief angles (前角和后角) Since only a few of the cutting edges are engaged with . the workpiece at a time, heavy cuts (大切削量切削)can be taken without adversely affecting the tool life. In fact, the permissible cutting speeds and feeds for milling are three to four times higher than those for turning or drilling. Moreover, the quality of surfaces machined by milling is generally superior to the quality of surfaces machined by turning, shaping, or drilling.

年级




11

专业、班


30

日 教 务 处 制

线

学院


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