He has got himself into a dangerous situation _____ he is likely to lose control over the plan. [ ]

A. where

B. which

C. that

D. why

短路电流计算采用标么值法，故此时( )。

A．相电压和线电压相等；

B．相电流和线电流相等；

C．单相功率和三相功率相等；

D．标么值电流代替标么值容量。