四冲程柴油机活塞最下面一道环都是刮油环 其外边缘如一边是斜面 则安装时斜面应该______以便活塞_
四冲程柴油机活塞最下面一道环都是刮油环,其外边缘如一边是斜面,则安装时斜面应该______以便活塞______。
A.朝上/上行时布油,下行时刮油
B.朝下/上行时布油,下行时刮油
C.朝上/上行时刮油,下行时布油
D.朝下/上行时刮油,下行时布油
请帮忙给出正确答案和分析,谢谢!
参考解答
正确答案:A
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