下列不属于断路器必填项的有（）。
A.调度编号
B.设备状态
C.细分类别
参考答案：C
一个数除以6，商是9，余数是4，这个数是______．
-I'm afraid you can't smoke here. Look at the sign,please.
-I'm Sorry , I_____see it[ ]
A. didn't
B. haven't
C. won't
D. can't
