正确答案: C

compressed air

题目：Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

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学习资料的答案和解析：

[单选题]若已知曲轴的轴线状态呈拱腰形，则其两主轴承高度必然（）于相邻轴承，测得臂距差为（）值。

高/负

[单选题]在柴油机投入使用一年或大修后，一般均要进行一次贯穿螺栓预紧力检查，检查时（）。

A．应当松开全部的主轴承螺栓

[单选题]轴系中心线的偏差度是指（）。

轴系实际中心线与理论中心线的偏差

[单选题]根据缺陷在螺旋桨桨叶上的部位不同和所造成的危害程度不同，将桨叶表面缺陷分为（）个区域。

3

[单选题]Compressed air is used on board ship （）.

All the above are true

[单选题]Dirty oil must be （） before being used again.

purified

[单选题]The external circumference of a pair of main bearing shells is slightly （） that of the bore of the housing which receives them Whats the meaning of “that” in the sentence above？

larger than

[单选题]Fins are installed on the generating tube surfaces in waste heat boilers to （）.

increase the rate of heat transfer