题干
The number of people invited to the party ______ fifty, but a number of them ______ absent for different reasons.
A：were; wa
B：was; wa
C：was; were
D：were; were
答案(点此获取答案解析）
C
是满偏电流（即小量程电流表允许通过的最大电流）Ig=3mA的电流表，其电阻Rg=10Ω，现借助一个定值电阻R0把它改装为一量程为3A的电流表，如图乙所示，下列判断正确的是（ ）
