一个不能忽略电阻的线圈,与一个电容串联,电路发生谐振,则线圈两端电压Ul和电容两端电压Uc的关系是()。
A.Ul>Uc
B.Ul=Uc
C.Ul
参考答案:A
—I have not finished with my dinner yet.
—But our friends ______ for us.
A.will wait
B.wait
C.have waited
D.are waiting
股票组合的β系数表示指数涨跌是该组合的β倍。()