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【多选题】
列有半圆的方法叙述正确的是 。
A.
可在已加工的大中，嵌入与工件材料不同的金属棒再钻，这样可以避免把上面的整圆部分刮大。
B.
转腰圆时，现在一端钻出整圆，另一端用半钻头加工
C.
钻出的不易产生倾斜
D.
钻半圆，要用手动进刀，压力要轻，以免吃刀太多，损坏钻头
E.
钻时，先用普通麻花钻头钻进一定深度，再用半钻头钻，这样容易控制钻头的定心和位置
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查看完整题目与答案
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