单选题活塞销的材料除选用优质碳钢外,还常选用()。A普低钢B合全渗碳钢C合金弹簧钢D合金调质钢
单选题
活塞销的材料除选用优质碳钢外,还常选用()。
A
普低钢
B
合全渗碳钢
C
合金弹簧钢
D
合金调质钢
参考解析
解析:
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