正确答案: A

活塞运动部件校中

题目：新造柴油机台架安装或在船上安装或大修后柴油机的安装均需进行（）测量。

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学习资料的答案和解析：

[单选题]Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.

aluminum alloy

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

fifteen

[单选题]In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.

expansion tank atmospheric vent