01 Unit Detection of Introduction

1、单选题：
​In training, the incorrect practice behavior is (  )‎
选项：
A: Do not do anything unrelated to the practice 
B: You can go back and do your own thing at any time
C: Obey the arrangements and deployment of the instructor
D: Observe class disciplines, do not arbitrarily leave your post and visit others during work hours
答案: 【 You can go back and do your own thing at any time】

2、单选题：
‌When multiple people operate a machine tool, (  )​
选项：
A: two people can operate the machine at the same time 
B: only one person can operate at the same time
C:  only one person can operate at the same time, and other students can leave the machine to rest 
D:  All of the above are correct
答案: 【 only one person can operate at the same time】

3、单选题：
‌The accuracy of the vernier calipers of 50 equally divided verniers is (  ) mm.‎
选项：
A:  0.05
B: 0.02
C:  0.5 
D: 0.2
答案: 【 0.02】

4、单选题：

‎The reading of the vernier caliper (there are 50 equal divisions on the vernier) is (  ) mm

‏

‎

‏选项：
A: 9.52
B: 10.52
C:  9.26
D: 10.26
答案: 【 10.52】

5、判断题：
‌Vernier calipers can be used as other tools.​
选项：
A: 正确
B: 错误
答案: 【 错误】

02 Unit Detection of Casting

1、单选题：

‍What molding method should be used to cast a single piece? (  )

​

‍

​选项：
A: Solid pattern molding 
B: Parted pattern molding
C: Three-part molding 
D: Loose piece molding
答案: 【 Parted pattern molding】

2、单选题：
​Excessive moisture in the molding sand will bring about (  ) on castings.​
选项：
A: blow hole
B: shrinkage cavity
C: sand hole
D: crack
答案: 【 blow hole】

3、判断题：
​Pouring temperature is too high will bring about crack on castings.‎
选项：
A: 正确
B: 错误
答案: 【 正确】

4、判断题：
‏When ramming the sand, in order to improve the efficiency, the molding sand can be added to the sand box at one time. ‏
选项：
A: 正确
B: 错误
答案: 【 错误】

5、判断题：
‏The gating system usually consists of a puring basin, a sprue, a runner and ingate.‍
选项：
A: 正确
B: 错误
答案: 【 正确】

03 Unit Detection of Milling

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