Three:they are hardening, temper and anneal.

三个过程：它们是淬火、回火和退火。

youdao

Three . They are hardening, temper and anneal .

三种。它们是淬火、回火和退火。

youdao

Three. They are hardening, temper and anneal.

三种。它们是淬火、回火和退火。

youdao

They are hardening, temper and anneal.

它们是淬火、回火和退火。

youdao

They are hardening, temper and anneal.

它们是淬火、回火和退火。

youdao