正确答案: B

motion

题目：Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative （）, so that surfaces dont get touch with each other.

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学习资料的答案和解析：

[单选题]废气锅炉窄点越（），锅炉受热面就越（），藜发量越（）。

小/大/大

[单选题]二冲程十字头式柴油机活塞运动部件纵向校中的目的是使活塞与气缸套在（）方向的间隙符合要求；导板和滑块之间的（）间隙符合要求。

首尾/侧面

[单选题]A main bearing consists of two shells which are secured by means of studs and （）.

bearing ca

[单选题]The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.

expansion

[单选题]The fuel injector pump is operated by （） which drives the plunger up and down.

a cam