要得到变压器的等效电路，需要先进行变压器的折算。
参考答案：对
It ___ we had stayed together for a couple of weeks ____ I found we had a lot in common.[ ]
A. was until, when
B. was until, that
C. wasn’t until, when
D. wasn’t until, that
下列属于统计专业职务的______。
A．总统计师 B．统计局长C．统计调研员 D．统计员
