连续切削的精加工及半精加工刀具常用()制造。
A. 陶瓷材料
B. 热压氮化硅
C. 立方氮化硼
D. 金刚石
The police are thetraffic accident that happened yesterday.
A. looking down upon
B. looking forward to
C. looking into
D. looking after
--________of his parentsliked pop music.-- So they did. It isnoisy.
All
B. None
C. Both
D. Neither