催眠镇静药是
A．哌替啶
B．保泰松
C．阿米妥钠
D．卡马西平
参考答案：C
解析：阿米妥钠是催眠镇静药。
如图所示电路中，当闭合开关后，两个电压表的指针均为图乙所示，则电阻R1和R2两端得到电压分别为 V和 V．
— I didn't tell my parents the secret yesterday.
— But you ______.
A．ought to do
B．ought to
C．should
D．ought to have
