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当前学科:发动机装调工技师
题目:
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()加工工艺性最好,()加工工艺性最差。
A . 通孔,阶梯孔
B . L/D=1--1.5短圆孔,阶梯孔
C . 通孔,盲孔
D . L/D=1--1.5短圆孔,盲孔
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