下列不属于防范药物的毒副反应的方法是（）。
A、选择毒副作用小的药物
B、有病不吃药
C、注意用药的时间
D、用药种类要简化
参考答案：B
---What did you look for me for, Mary?
--- The boss wondered where you ___________ and how long you __________ there.
A．had been, had been
B．had gone, had gone
C．had been, had gone
D．had gone, had been
风机水封液下泵额定流量为（）m³/H，电机功率为（）Kw
