She _____ when I came in. [ ]
A. is drawing
B. was drawing
C. drew
D. draws
答案:B
哌唑嗪的降压作用机制是通过( )
A.阻断α1受体
B.阻断β受体
C.钙通道阻滞
D.抑制血管紧张素I转换酶
E.直接扩张血管
主权,是一个国家的生命和灵魂。()