题目内容

他从吊杆上摔下来,受了伤。

A. He was injured by a wood block.
B. He fell from the crane and was injured.
C. He was unconscious.
D. He was dead on the spot.

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A. Start the stand-by generator.
B. Start all the running machines.
C. To seal off boilers.
D. Open the inlet valve.

A. 进油节流
B. 回油节流
C. 旁路节流

A. 可以
B. 不可以
C. 看情况而定

A. 形状
B. 压力
C. 通流面积
D. 压力差