关于活塞销的材料 结构与表面处理 正确的有________。I.铸铁II.合金钢III.中空结构IV
关于活塞销的材料、结构与表面处理,正确的有________。I.铸铁II.合金钢III.中空结构IV.实心结构V.表面退火VI.表面淬火
A.III+IV+VI
B.I+II+III
C.IV+V+VI
D.II+III+VI
请帮忙给出正确答案和分析,谢谢!
参考解答
正确答案:D
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