轴承的精度等级分C、（）；（）；（）级，其中C级轴承精度最高、F级最低。
参考答案：D、E、F
You ____ all those clothes! We have a washing machine to do that sort of thing. [ ]
A. needn't have washed
B. shouldn't have washed
C. must not have washed
D. can not have washed
产品责任保险不负责( )。
A．有缺陷产品引起的人身损失
B．有缺陷产品引起的财产损失
C．有缺陷产品的置换
D．必要的法律费用支出
