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【单选题】
用摇臂钻加工,为了保证相邻两的距,最好的工艺方法是 ( ) 。A.
先钻第一，移到位后再钻第二
B.
分别用小钻头钻出两个，检查距后再用合格直径钻头扩
C.
用小钻头钻第一，并扩接近要求值；再用小钻头钻第二，扩；检查距，调整位置后扩到要求尺寸
D.
划线定好两中心位置，并打中心，用钻头先后钻两即可
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