活塞环的主要作用是______。A.散热B.密封C.布油D.形成油膜请帮忙给出正确答案和分析 谢谢!
活塞环的主要作用是______。
A.散热
B.密封
C.布油
D.形成油膜
请帮忙给出正确答案和分析,谢谢!
参考解答
正确答案:B
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