考虑到工商系统业务的特点，容灾系统建设中属于非站点失败的风险主要有（）
A.重大误操作
B.存储系统失败
C.机房掉电
D.火灾
参考答案：A, B
—My teacher says she’s canceling the class play. I just can’t understand.
— __________. You were looking forward to it.
A．It doesn’t matter.
B．It’s very unwise of her.
C．Don’t worry about it.
D．You must be disappointed.
零件的粗、精加工为什么要分阶段进行？
