当CT的变比为630/5,二次电流为2A时,一次电流为()A。
A.300
B.320
C.263
D.252
参考答案:D
—What terrible weather!
—Yes . It’s been raining for two weeks, completely ____ our holiday .
A.ruined
B.to ruin
C.to have ruined
D.ruining
绝热操作的简单平衡级设计变量数为()。
A.2c+3个
B.2c+4个
C.c+5个
D.2c+5个