白通甲、乙线路CT的变比是（）。
A.3000/5；
B.2500/5；
C.2000/5；
D.1500/5。
参考答案：B
Sub过程与Function过程最根本的区别是（ ）。
A．12 12
B．12 21
C．21 12
D．21 21
His efforts to raise money for his program were ________ because no one showed any intention to take
a cent out of their pockets. [ ]
A. in place
B. in sight
C. in effect
D. in vain
