带有雪橇型键槽且根部有适当圆角的双螺旋桨轴或艉轴，其检验间隔

【名词&注释】

螺旋桨轴(propeller shaft)、双螺旋桨(double propellers)

[单选题]带有雪橇型键槽且根部有适当圆角的双螺旋桨轴或艉轴，其检验间隔期规定为（）。

A. 2年
B. 3年
C. 4年
D. 5年

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[单选题]艉轴铜套损坏的主要形式有（）。Ⅰ.腐蚀；Ⅱ.裂纹；Ⅲ.过度磨损；Ⅳ.套合松动；Ⅴ.接缝不良。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ
C. Ⅱ+Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ

[单选题]（） allows for expansion and water make up in the water cooling system.

A. A top tank
B. A head tank
C. A head valve
D. A drain tank

[单选题]The injector pump is operated by a cam which drives the （） up and down.

A. piston
B. drum
C. plunger
D. barrel

[单选题]Valve overlap is the period during which （）.

A. the inlet valve is open
B. the exhaust valve is open
C. both valves are closed
D. both valves are ope

[单选题]Engine displacement is equal to the cylinder （）.

A. area times the stroke
B. area times the stroke, times the number of cylinders
C. volume times the stroke
D. volume times the stroke, times the number of cylinder

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