The main generators are connected to（）.
A. distribution boards
B. section boards
C. emergency switch boards
D. main switch board
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承认真理的相对性就是承认：（）。
A. 在相对真理中不包含绝对真理的颗粒
B. 世界是不可穷尽的，认识有待于深化
C. 世界上尚有未被认识的东西，认识有待于扩展
D. 真理是具体的和历史的
E. 真理是人们对客观事物的一定方面、一定程度、一定层次的正确反映
下列不属于轿车用的电动玻璃升降器组成部分的是（）。
A. 电动机
B. 减速器
C. 导向板
D. 起动机
You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE? （）
A. Washing water should be recirculated if possible because it has the same electric potential as the cargo tank being cleaned
B. The hoses to portable cleaning machines should be disconnected before the machines are removed from the tank
C. The principal hazard with steaming cargo tanks is raising the ambient temperature above the flame point of the cargo residue
D. Steam cleaning and water washing are both capable of generating electrostatic charges within a tank
冲裁模按照工序组合的形式同样可以分为复合冲裁模、（）和连续冲裁模。
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