变压器的作用有变电压、()等。
A、变频率
B、变电流
C、变相位
D、变阻抗
参考答案:B, C, D
With a lot of difficult problems ________, the newly-elected president is going to have a hard time.
A.settled
B.settling
C.to settle
D.to be settled
1936年民族资本银行的存款约占当时全国银行业存款总额的()
A、30%
B、20%
C、40%
D、50%