国际投资环境的主要特点是().
A.多变性
B.系统性
C.综合性
D.动态性
参考答案:B, C, D
It ________ we had stayed together for a couple of weeks _________ I found we had a lot in common. [ ]
A. was until; when
B. was until; that
C. wasn't until; when
D. wasn't until; that
在多发性大动脉炎的急性期,首选:()
A.抗生素
B.激素
C.抗血小板药物
D.扩血管药物
E.介入治疗