ZN63A型断路器操作电压为最高值时,分闸时间为:( )ms。
A.40~65
B.25~50
C.35~60
D.20~45
参考答案:B
因其信用度高,英国国债又被称为“金边债券”。()
Our plan didn't get up the ground because no one could come.
A.get over
B.get on
C.get off
D.get through