问题描述:
[单选]
The lowest ring of a piston is().
A.a coil spring
B.a sealing ring
C.an oil distributor ring
D.main seal ring
参考答案:查看无
答案解析:无
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答案解析:无
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上一篇:The lubricating oil is pumped from the drain tank, very often with()in the suction line.
下一篇:The lower end of each piston rod is reduced in diameter to fit a bore in().
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