（） usually helps to induce air movement to assist combusti

【名词&注释】

柴油机(diesel engine)、极限值、活塞环(piston ring)、说明书(specification)、便于管理(convenient for managing)

[单选题]（） usually helps to induce air movement to assist combustion.

A. Cylinder cover
B. Main bearing
C. The exhaust valve
D. The piston movement

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学习资料：

[单选题]当十字头式柴油机缸径＜700mm时，在未装活塞环的条件下，活塞位于近上、下止点位置时，活塞裙部减磨环与气缸内孔单边最小间隙应不小于（）。

A. 该处总间隙的30%
B. 说明书规定极限值的30%
C. 该处总间隙的20%
D. 说明书规定极限值的20%

[单选题]短轴系具有（）的特点，所以目前造船趋势大都采用艉机舱或近尾机舱。Ⅰ.结构简单；Ⅱ.便于管理^{(convenient for managing)}；Ⅲ.便于船舱布置；Ⅳ.节省造船费用；Ⅴ.中间轴数量少。

A. Ⅱ＋Ⅲ＋Ⅳ
B. Ⅰ＋Ⅱ
C. Ⅰ＋Ⅱ＋Ⅴ
D. Ⅰ＋Ⅲ

[单选题]Each cylinder liner on the marine medium speed engines （）.

A. is usually cooled by sea water
B. can be replaced when worn out
C. is in direct contact with the water in the bore of the cylinder
D. can t expand when heated

[单选题]The mechanical efficiency of an engine （） because losses occur in the form of friction.

A. is always less than 100%
B. is always more than 100%
C. is always equal to 90%
D. is always less than 90%

[单选题]The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.

A. 8-10℃
B. 10-12℃
C. 10-15℃
D. 10-20℃

[单选题]In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）

A. Bed plate
B. Column
C. Entablature
D. Tie rod

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