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2024春季学期专业英语期末试卷B卷

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XXXXXX学院

2024年春季学期《专业英语》试卷B卷

适用班级_

考试班级_______________ 姓名_____________ 学号________________

题 号 实得分 阅卷人 一 二 三 四 总得分 复核人 一、选择题。(5分)

1. Most drilling machines are on three axes.

A. programmed B. program C. programming D. progress 2. The magnitude of the emf depends the material used. A. in B. on C. out D. with

3. The supporting structure may be assembled bolts or rivets or by welding. A. in B. on C. out D. with

4. The mobile communication industry has in three stages. A. evolved B. evolving C. involve D. involving

5. up to megabits per second are achievable with 3G. A. speed B. speeds C. speeding D. speeded

6. These motors are, a rule, especially designed for the specific machines with which they are used.

A. as B. for C. with D. by

7. This thermoelectric effect is widely used in temperature and control system. A. mean B. measurement C. sure D. meaning

8. to the construction of CNC machine tools, CNC machines work in the following manners.

A. Accord B. According C. Accorded D. Across

9. NC is on all types of machine tools from the simplest to the most complex. A. be used B. being used C. be using D. being using

10. The World Wide Web has become the primary interface already. A. communicate B. communication C. communicating D. communicated

二、翻译下列专业词组。(30分) 11. the basic wheel 12. packet 13. jigsaw puzzle 14. World Wide Web 15. AC motor 16. constant-speed

21.位移 22.磁场 23.压电效应 24.反馈系统 25.脱机的 26.生产任务

17. single-phase 18. portable tool 19. power supply 20. resolution

27.数字控制 28.齿轮加工 29.水平运动 30.计算机数控

三、翻译下列句子。(30分)

31. Squirrel-cage motor requires very little control equipment.

______________________________________________________________________________________________________________________________________________________________ 32. Manufacturing engineers have centered their efforts on the development of standardized elements.

______________________________________________________________________________________________________________________________________________________________ 33. The most common machine element is the gear, which is a combination of the wheel and the lever to form a toothed wheel.

______________________________________________________________________________________________________________________________________________________________ 34. The hardness of a gear determines its ability to resist wear.

______________________________________________________________________________________________________________________________________________________________ 35. When such motors are used, they are usually built into the equipment by the machinery manufacturer , as in portable tools, office machinery, and other equipment.

______________________________________________________________________________________________________________________________________________________________ 36.数据传输速度取决于通话环境。

______________________________________________________________________________________________________________________________________________________________ 37.传感器是一种将被测量转化成光的、机械的或者更平常的电信号的装置。

______________________________________________________________________________________________________________________________________________________________ 38.其次,数字移动电话系统在许多国家除了提供有声通信服务外,还增加了低速数据服务,如短信服务。

______________________________________________________________________________________________________________________________________________________________ 39.因为鼠笼式电动机具有多种速度和转矩特性,几乎所有的恒速机器均可由交流鼠笼式电动机驱动。

______________________________________________________________________________________________________________________________________________________________ 40.电容式和电感式传感器的重要特征是:无限的分辨率。可以精确到满量程的±0.1%。 ______________________________________________________________________________________________________________________________________________________________

四、阅读理解。(10分)

One principle aim of kinematics is to create (design) the desired motions of the subjects’ mechanical parts and then mathematically compute the positions, velocities, and accelerations, which those will create on the parts. Since, for most earthbound mechanical systems, the mass remains essentially constant with time, defining the accelerations as a function of time then also defines the dynamic forces as a function of time. Stresses, in turn, will be a function of both applied and inertial (ma) forces. Since engineering design is charged with creating systems which will not fail during their expected service life, the goal is to keep stresses within acceptable limits for the materials chosen and the environmental conditions encountered. This obviously requires that all system forces be defined and kept within desired limits. In machinery, the largest forces encountered are often those due to the dynamics of the machine itself. These dynamic forces are proportional to acceleration, which brings us back to kinematics, the foundation of mechanical design. Very basic and early decision in the design process involving kinematic principles can be crucial to the success of any mechanical design; a design which has poor kinematics will prove troublesome and perform badly.

Any mechanical system can be classified according to the number of degree of freedom (DOF) which it processes. The system’s DOF is equal to the number of independent parameters which are needed to uniquely define its position in space at any instant of time.

A rigid body free to move within a reference frame will, in the general case, has complex motion, which is a simultaneous combination of rotation and translation. In three-dimensional space, there may be rotation about any axis and also simultaneous translation which can be resolved into components along three axes. In a plane, or two-dimensional space, complex motion becomes a combination of simultaneous rotation about one axis (perpendicular to the plane) and also translation resolved into components along two axes in the plane.

41. Kinematics research focus on the following EXCEPT ______.

A. accelerations B. force C. positions D. velocities

42. From the passage that for the design engineer the first and most important is____

A. the service life of a machine B. the materials choose C. the degree of freedom D. kinematic principles

43. An mechanical system has uniquely defined position in space at any instant of time that ___.

A. It should has one DOF B. It should Has two DOF

C. the DOF and the number of independent parameters should equal D. It should has any DOF as want

44. Which one of the following is NOT TRUE _______?.

A. A rigid body free to move in three-dimensional space may rotation about any axis

B. A rigid body free to move in three-dimensional space is a simultaneous combination of rotation and translation

C. A rigid body free to move in three-dimensional space can be resolved into components along three axes

D. A rigid body free to move in three-dimensional space may has complex motion

2024春季学期专业英语期末试卷B卷

XXXXXX学院2024年春季学期《专业英语》试卷B卷适用班级_考试班级_______________姓名_____________学号________________题号实得分阅卷人一二三四总得分复核人一、选择题。(5分)
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