电压互感器的作用是（）
A.升压
B.变压
C.变流
D.计量
参考答案：B
If I a quarrel with him yesterday, we together now.
A．hadn’t had; would stay
B．haven’t had; would have stayed
C．didn’t have; would stay
D．hadn’t had; would have stayed
采煤工作面进风巷水幕应设在工作面进风巷风流汇合点以外。（）
