51吃瓜

1. ????? ?? ????? ?? Reasonable use of cutting tools: for different workpiece materials and processing requirements, it is necessary to choose different cutting tools to achieve better processing results.

2. ?????? ??? ????: ?????? ?? ??????? ??? ???? ???? ?? ????? ???? ?? ????? ?? ??? ??? ??? ?????? ?? ???? ????? ???? ??????

3. ???? ?????????? ?? ???? ?? ???? ??? ??? ??: ????? ????? ???? ??? ???? ?????????? ?? ??? ???? ???? ????? ???? ???? ?? ??? ???? ?????????? ?? ???? ??? ?? ???? ???? ?? ????? ??.