单项选择题
A.铣出—平面后再钻孔→用中心站钻孔→用小钻头钻孔→将工件放正锪窝再钻孔B.将工件放正锪窝再钻孔→用中心站钻孔→用小钻头钻孔→铣出—平面后再钻孔C.将工件放正锪窝再钻孔→用小钻头钻孔→铣出—平面后再钻孔→用中心站钻孔D.用中心站钻孔→用小钻头钻孔→铣出—平面后再钻孔→将工件放正锪窝再钻孔