水磨石分格条采用水泥浆固定，水泥浆顶部应低条项（）mm。
A、3~4
B、4~6
C、6~8
D、8~10
参考答案：B
You should have got all the work _____ on time. Why didn't you? [ ]
A. finishing
B. to finish
C. finish
D. finished
非直接接地系统一相接地时，为何接地相电压降低而其他两相电压升高？
