外接辅助电源电压变化范围不超过额定值的(),频率变化范围不超过额定值的()。
A.±10%,±5%
B.±20%,±5%
C.±20%,±2%
D.±10%,±2%
参考答案:A
Peter forgot to tell you when ________.
A.did he call you up
B.he called you up
C.did he call up you
D.he called up you
为什么说贪执无常的亲友,是非常愚痴的行为?我们应怎样将此转为道用?