[单选题]船上吊缸检修后，装复活塞运动部件时，正确的操作是（）。

正确答案 ：B

应按规定的预紧顺序和预紧力安装气缸盖螺栓

[单选题]The lower end of each piston rod is reduced in diameter to fit a bore in （）.

正确答案 ：A

the crosshead

[单选题]Under manoeuvring condition the main engine may run on （）.

正确答案 ：B

marine diesel oil

[单选题]The crankcase of many diesel engines are kept under a slight vacuum by the （）.

正确答案 ：D

crankcase exhaust fa

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