《专业英语》期末考试卷答案

XX职校2018年春季《专业英语》期末考试卷（参考答案）

考试时间 120分钟

学号姓名班级年级

一、单选题(每小题2分，共30分)

1. If all points in a linkage move in parallel planes the system undergoes plan ar motion and the linkage may be describ ed as a ______ .

A. planar motion

B. planar linkage

C. joints

D. slide

2. Though frame material and desig n should handle damping,

_____ are sometimes built into frame sec tions to handle specific problems.

A .beams B. holes C. dam pers D. screw

3. The maximum allowable deflecti on of a shaft ______ determined by critic al speed, gear, or bearing requirements.

A. often

B. must

C. was

D. is u sually

4. We will have to _____ to better a nd better solutions as we generate more i nformation.

A. repeat many times

B. iterating

C. iterate

D. try ways

5. If a product configuration is ___ ____ specified and then examined to dete rmine whether the performance requirem ents are met.

A. finally

B. tentatively

C. tempo rary

D. have been

6. Manufacturing can be defined as the _____ of raw materials into useful pr oducts through the use of the easiest and lest-expensive methods.

A. transformation

B. processing C . process D. transforming

7. The planer and knee types of milli ng machine is _____ because of its flexib ility.

A. used most commonly

B. most popular

C. the most commonly used

D. most powerful

8. As a result, the system will vibrat

e at the frequency o

f the _____ force re

g ardless of the initial conditions or natural frequency of the system.

A. action

B. excitation

C. out

D. act

9. Before two components are asse mbled together, the relationship between the dimensions of the mating surfaces___ ____.

A. must be giving out

B. should p rinted clearly

C. must be specified

D. should be clearly noted

10. The main practical advantage of lower pairs is their better ability to trap lu bricant between their ______ surfaces.

A. enveloping

B. mating

C. outer

D. outside

11. The word______ itself usually r efers to the deterioration of metals and ce ramics, while similar phenomena in plast ics generally called ______.

A. recrystallization…. corrosion

B. recrystallization…degradation

C. degradation…corrosio n

D. corrosion… degradation

12. Most frames _______ cast iron, weld steel, composition, or concrete.

A. are made from

B. are made up of

C. was produced by

D. was consist of

13. Rotating shafts particularly thos

e that run at high speeds, must be designe d to avoid operation at ______ speeds.

A . low

B .overload C. cri tical D. hollow

14. Although cast iron is a fairly che ap material, each casting requires a ____ __ 。

A. pattern

B. model

C. mold

D. patent