正确答案: D

The piston movement

题目：（） usually helps to induce air movement to assist combustion.

查看原题 查看所有试题

学习资料的答案和解析：

[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（）。

该处总间隙的30%

[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；Ⅲ.便于船舱布置；Ⅳ.节省造船费用；Ⅴ.中间轴数量少。

Ⅰ＋Ⅱ＋Ⅴ

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

can be replaced when worn out

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

is always less than 100%

[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 （）.

8-10℃

[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?（）

Tie rod