单用一种吸入麻醉药维持麻醉时其MAC应达（）
A.3MAC
B.5MAC
C.1MAC
D.3MAC
E.2MAC
参考答案：D
属于酒店产品投放期营销策略的是（）。
A.高价低促销策略
B.产品品牌策略
C.调整营销组合策略
D.抛弃策略
It is most instructive lecture that I _______ since I came to this school.
A．attended
B．had attended
C．am attending
D．have attended
