正确答案: D

A+B+C

题目：为了提高船舶动力装置的经济性，（）部门应对整个动力装置进行综合分析。

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学习资料的答案和解析：

[单选题]船舶有效功率与主机有效功率的差值，是存在着（）所造成的。

A+B

[单选题]柴油机排气系统的背压与（）。Ⅰ.废气流速的平方成正比；Ⅱ.与管径的4次方成反比

Ⅰ，Ⅱ都对

[单选题]During （）, the starting air valves should be closed to prevent the engine from turning.

overhaul

[单选题]The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.

measured quantity；sufficient

[单选题]Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.

check and regulate the water level

[单选题]In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the （）.

bottom of the lube oil sump

[单选题]Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and （）.

vanadium