直流电路中电阻两端电压为12V，其电流为8A。该电阻阻值为（）Ω。
A.1
B.1.2
C.1.5
D.3
参考答案：C
— Has Yang Liping returned from Yunnan yet? I’d like to meet her.
— Sorry. She _______ back here only for last weekend.
A．has been
B．would be
C．had been
D．was
醛固酮的主要作用是（）
A.保K+排Na+
B.保Na+排K+
C.保Na+保K+
D.保Na+排H+
E.保K+排H+
