问题描述:
[单选]
There should be a lubricating oil()between the main beatings and the crankshaft.
A.film
B.cap
C.lacquer
D.shell
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答案解析:无
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上一篇:These piston rings are so badly worn that they must be().
下一篇:There is an injection pump for each cylinder, which is usually operated once every cycle by()on the camshaft.
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