当粗加工、强力切削或承冲击载荷时，要使刀具寿命延长，必须减少_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题判断题

当粗加工、强力切削或承冲击载荷时，要使刀具寿命延长，必须减少刀具摩擦，所以后角应取大些。

答案

参考答案：错

选择题

25. After many years’ tough talks, Vietnam became the 150th member ________ the WTO last year.

A．joining

B．having joined

C．to join

D．Joined

判断题

编码器的Z信号可作为零位参考信号。