在角铁上装夹、加工工件,可以不考虑平衡问题。( )
参考答案:错
Don't _____ your coat, Mary! It's easy to catch a cold here at this time of year. [ ]
A. take away
B. take down
C. take off
D. take out
五尖九刃麻花钻的两侧横刃为(),刃宽较窄。
A.尖刃
B.单刃
C.内刃
D.外刃