代赭石除具有平肝潜阳作用外，还能（）
A.收敛固涩
B.镇惊安神
C.清肝明目
D.降逆止呕
E.坠痰平喘
参考答案：D
Culture shock is a feeling ____ most travellers experience in a foreign country ____ they find the
culture is quite different from that of their own. [ ]
A. that; which
B. which; that
C. which; where
D. when; where
进行心肌超声造影，最造影剂有什么要求：
A．微气泡直径小于5μm
B．微气泡要有厚的包裹膜
C．微气泡的压缩系数要小
D．微气泡密度要高
E．微气泡直径大（大于红细胞）
