铰孔可以提高孔的尺寸精度、减小孔表面粗糙度,还可以对原孔的偏斜进行修正。
参考答案:错
If you get lost, you should keep calm because all that you’ve lost maybe just a bit of information.
刀具和被加工的零件表面在工作时会产生()
A.400℃的高温
B.300℃的高温
C.500℃的高温
D.600℃的高温