题目内容

二级空气压缩机

A. The two-stage air compressor.两级空气压缩机
B. The one-stage air compressor.
C. The two-stroke air compressor.两冲程
D. The four-stroke air compressor.

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

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