单项选择题
A.4 B.3 C.2 D.5
A.550-1100MM B.600-1000MM C.700-1200MM D.550-1000MM
A.旋转钻 B.人力钻 C.简易钻 D.麻花钻
A.100MM B.80MM C.97MM D.91MM
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