活塞外圆面的磨损测量部位是_______的直径A.裙部B.裙部上数个点处C.头部D.活塞上 下部请帮
活塞外圆面的磨损测量部位是_______的直径
A.裙部
B.裙部上数个点处
C.头部
D.活塞上、下部
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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