下列宜切细丝的药物是（）
A.黄柏
B.厚朴
C.陈皮
D.荷叶
E.枇杷叶
参考答案：A, B, C
---- How does your father usually go to work?
---- He _____drive a car, but now he _____ there to lose weight.
A．used to; is used to walk
B．was used to; is used to walking
C．was used to; is used to walk
D．used to; is used to walking
如图所示，定值电阻Rl=6Ω，R2=12Ω，当开关S断开时，电流表的读数为I1=0.6A；当开关S闭合时，电流表的读数为I2=0.84A，求电源的电动势E和内电阻r．
