电路如图所示，电容初始电压为零，开关在t=0时闭合，则t≥0时u（t）为（）。
A.A
B.B
C.C
D.D
参考答案：C
—Where does your mother work?
— she's working abroad.[ ]
A. At present
B. It's hard to say
C. Later on
D. No matter where
湿邪致病最易损伤的是（）。
A.心阳
B.肺阳
C.脾阳
D.肝阳
E.肾阳
