问题
多项选择题
钻头按结构及工作原理分类可分为（）。
A.刮刀钻头
B.牙轮钻头
C.PDC钻头
D.取芯钻头
E.金刚石钻头
答案
参考答案：A, B, C, E
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钻头按结构及工作原理分类可分为（）。
A.刮刀钻头
B.牙轮钻头
C.PDC钻头
D.取芯钻头
E.金刚石钻头
参考答案：A, B, C, E
| 用方框中所给词的适当形式填空。 | |
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