直流线路对地故障瞬间，从逆变侧检测到直流电压（）。
A.下降
B.上升
C.不变
D.波动
参考答案：A
It is his cleverness, not his strenth, ____ defeated his rival.
A．that
B．which
C．what
D．who
企业现金付款管理的主要做法有( )。
A．使用现金浮游量
B．透支
C．支票代替汇票
D．利用付款浮动期
