电压比校核，对于3P准确级电压互感器，一次电压下的误差应不大于（）。
A.1%
B.3%
C.5%
D.7%
参考答案：B
How long do you think it will be _______ China sends another manned spaceship to the moon?
A．when
B．until
C．that
D．before
技术转让合同
