转舵时声音异常可能是（）。

【名词&注释】

表面粗糙度、活塞环(piston ring)、超负荷(overload)、柴油机气缸套(engine cylinder liner)

[单选题]转舵时声音异常可能是（）。

A. 舵承间隙过大
B. 舵承间隙过小
C. 舵杆变形
D. 舵杆折断

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学习资料：

[单选题]柴油机气缸套^{(engine cylinder liner)}与活塞环工作表面间油膜变薄或遭到破坏，是由于（）等因素造成。Ⅰ.润滑不良；Ⅱ.活塞运动装置对中不良；Ⅲ.冷却不良；Ⅳ.超负荷；Ⅴ.工作表面粗糙度低。

A. A．Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
B. B．Ⅰ＋Ⅳ＋Ⅴ
C. C．Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ+Ⅴ
D. D．Ⅰ＋Ⅱ＋Ⅲ

[单选题]船轴不包括（）。

A. 推力轴
B. 中间轴
C. 艉轴
D. 曲轴

[单选题]Due to （） action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.

A. reciprocating
B. rotating
C. running
D. removing

[单选题]Once all cylinders are firing regularly, （） is shut off.

A. the exhaust valve
B. the starting air
C. the inlet valve
D. the fuel oil

[单选题]The emulsion of the oil is mainly caused by （）.

A. the solid impurities of large particle
B. the solid impurities of fine particle
C. the water content
D. both water and solid impuritie

[单选题]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）

A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time

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