电板、电器设备必须有接地装置，并有防雨雪、防潮设施；停电后应()。
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井下（）台电气设备的地点应装设局部接地极。
A. 3
B. 4
C. 5
不属于“三违”的是（）
A. 违章作业
B. 违章指挥
C. 违反劳动纪律
D. 违法
保险带必须拴在牢固可靠处，并应（）。
A. 拴在井口钢梁上
B. 低挂高用
C. 高挂低用
The passage implies that which of the following was true of introductory courses in Asian
A. The range of different textbooks that could be assigned for such courses was extremely limited.
B. The texts assigned as readings in such courses were often not very challenging for students.
C. Students often complained about the texts assigned to them in such courses.
D. Such courses were the only means then available by which people in the United States could acquire knowledge of the field.
E. Few students wanted to take such courses.
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