题目内容

活塞环磨坏了。

A. The piston rings were taken out.
B. The piston was cracked.
C. The piston was broken.
D. The piston rings were worn out.

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A. the engine room.集控室
B. test the generator.测试
C. Go ahead to front of the team.队的前面
D. Try the main engine.

A. Chain drive.
B. Gear drive.
C. Motor drive.
D. Either chain drive or gear drive.

At 7-day's interval.
B. At 8-day's interval.
C. At regular interval.规律的间隔
D. Irregularly.不规则

A. Push the button of power supply .
B. Check everything .
C. Start oil pump.
D. Open the steam valve.