根据加热温度和冷却方法的不同,热处理可分为哪些工艺?
参考答案:
退火、正火、淬火、回火等工艺。
Hello, may I have an appointment with the headmaster?()
A.Sorry, I don't know you
B.No, you can't
C.Certainly. Wait a minute, please
D.Let me see
简述抵押权和动产质权的区别。