要扩大直流电压表的量程,应采用()。
A.并联分流电阻
B.串联分流电阻
C.串联分压电阻
D.并联分压电阻
参考答案:C
I think it’s really _________ hard work for me to finish the job in twenty minutes.
A.a
B.an
C.the
D.不填
图1所示正弦稳态电路中,电流表的读数(有效值)为()