正确答案: D

A+B

题目：船舶营运期间，（）对保证动力装置的可靠性有重要意义。人为故障比例增加就是证明。

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学习资料的答案和解析：

[单选题]Due to （） action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.

reciprocating

[单选题]The （） of the lubricant should be sufficient to hold the film together, but it should allow the lubricant to flow easily.

viscosity

[单选题]The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the （） caused by the friction at the bearings.

heat