获得单位用药效果所投入的成本尽可能低属于
A．用药经济性
B．用药适当性
C．两者皆是
D．两者皆不是
E．用药安全性
参考答案：A
The police asked him to _________what he had seen. [ ]
A. set about
B. set down
C. set up
D. set out
737飞机有哪些外部灯光？
