活塞头部触火面裂纹部位主要在______。Ⅰ.顶面;Ⅱ.头部;Ⅲ.第一道环槽根部;Ⅳ.槽脊;Ⅴ.起吊
活塞头部触火面裂纹部位主要在______。Ⅰ.顶面;Ⅱ.头部;Ⅲ.第一道环槽根部;Ⅳ.槽脊;Ⅴ.起吊孔边缘。
A.Ⅰ+Ⅱ+Ⅳ
B.Ⅰ+Ⅳ
C.Ⅰ+Ⅲ+Ⅴ
D.Ⅰ+Ⅲ
请帮忙给出正确答案和分析,谢谢!
参考解答
正确答案:C
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