正确答案: D

A+B

题目：推进装置的推进效率为推进轴上总有效功率与推进装置消耗的热量之比，因此它与（）无关。

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学习资料的答案和解析：

[单选题]可靠性对船舶动力装置具有特别重要的意义，可靠性不足会（）。

A+B

[单选题]故障率曲线分为三个阶段，不能列为三个阶段之中的是（）。

平均故障期

[单选题]在水平平面内，当曲柄的两个主轴承位置偏左，曲轴轴线呈左弧线弯曲（即呈“（”形）时，该曲柄的臂距差Δ-为（）值。

负

[单选题]Blow-off of the relief valves of the main cylinders during operation indicates （）.

the cams are not properly set

[单选题]The crank-room cover should not be opened until at least （） minutes after the engine stops.

15

[单选题]The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed （）.

nip

[单选题]Which of the following would cause a diesel to have black smoke?（）

leaky injector

[单选题]Cross scavenging requires the fitting of （） to prevent air or exhaust gas escape when the piston is at the top of the stroke.

a piston skirt