用有载调压变压器的调压装置进行调整电压时,对系统来说()。
A、起不了多大作用
B、能提高功率因数
C、补偿不了无功不足的情况
D、降低功率因数
参考答案:C
They'll ________ the subway to the space museum. It'll ________ them half an hour.[ ]
A. take; bring
B. bring; take
C. take; take
D. bring; bring
同义句转换。
He makes a living by selling vegetables. He____by selling vegetables.