问题
单项选择题
用扩孔钻扩孔是孔加工的方法之一。扩孔钻的特点（）。
A.齿数少，导向好，切削平稳
B.齿数少，导向好，切削平稳
C.齿数多，导向差，切削平稳
D.齿数少，导向差，切削不平稳
答案
参考答案：A
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用扩孔钻扩孔是孔加工的方法之一。扩孔钻的特点（）。
A.齿数少，导向好，切削平稳
B.齿数少，导向好，切削平稳
C.齿数多，导向差，切削平稳
D.齿数少，导向差，切削不平稳
参考答案：A
| 完型填空。 | |||
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