何谓冷作硬化
参考答案：工件表面在加工过程中产生强烈的塑性变形后，其强度、硬度都得到提高并达到一定深度，这种现象称作冷作硬化。
填空题
1. It is a ______ (下雨的)day. We’d better not walk there.
2. The man is friendly to us, but that woman is very_____(不友好的).
3. Bob thinks Japanese food is ______(极坏的).
4. The beaches in Qingdao were_______(极好的).
5. How was your______ _______ (汽车旅行)?
CPU不能直接访问存储器是( )。
A．ROM
B．RAM
C．CACHE
D．光盘
