转舵不准，舵角不正可能是（）。

【名词&注释】

活塞环(piston ring)

[单选题]转舵不准，舵角不正可能是（）。

A. 舵杆折断
B. 舵叶进水
C. 舵杆变形
D. 舵承间隙过小

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学习资料：

[单选题]在船上吊缸检查活塞组件时，不必检测（）。

A. 活塞环的弹力
B. 天地间隙
C. 搭口间隙
D. 活塞环的金相组织和硬度

[单选题]在船上测量曲轴臂距差时，以曲柄销位置为准记录臂距值时，应自（）开始测量。

A. 曲柄销位于195°处
B. 曲柄销位于165°处
C. 曲柄销位于15°处
D. 曲柄销位于345°处

[单选题]Dirty oil must be （） before being used again.

A. mixed with clean oil
B. purified
C. heated
D. strained

[单选题]The rim of the piston may contain cut-out portions to accommodate （） when they open.

A. the gases
B. the air
C. the valves
D. the injector

[单选题]When a crankshaft has to be handled outside the engine, it should be carefully supported in a manner which will avoid （） high bending moments on it.

A. compressing
B. interposing
C. imposing
D. pounding

[单选题]The hot expanding gas rotates the blades of the exhaust turbine, thus （） a large of its power, （） drives the compressor.

A. to give off；which
B. giving off；which
C. to give off；that
D. giving off；that

[单选题]The fuel injection system is very important, so any trouble of it will （） the operation of the main engine.

A. be affected
B. affect
C. be effected
D. effect

[单选题]Crank web deflection readings will give a positive indication of （）.

A. worn main bearing journals
B. torsional stress deformation
C. slack thrust bearings
D. bearing shells shim dimensio

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