评定金属材料塑性指标常用（）。
A、伸长率和韧性
B、断面收缩率和韧性
C、伸长率和断面收缩率
D、断面收缩率和屈服强度
参考答案：C
–Mary looks down today, what’s up?
--Well, ________happened between Mary and me is none of your business.
A．whichever
B．no matter which
C．whatever
D．no matter what
什么是发电机的调整特性？
