保护主义的各种理论基础中,经济理论界普遍认为可以接收的理由包括()
A.保护幼稚工业
B.保护国内市场
C.减少失业
D.国防安全
E.发展中国家工业化
参考答案:A, D, E
All these gifts must be mailed immediately _____ in time for Christmas. [ ]
A. in order to have received
B. in order to receive
C. so as to be received
D. so as to be receiving
Ⅰ类(快速杀菌剂)+Ⅳ类(慢效抑菌剂)抗菌药联合用药的可能效果是()。
A.协同作用
B.累加作用
C.拮抗作用
D.无关或累加
E.无关或拮抗