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问题 多项选择题

慢性心力衰竭使用β受体阻滞剂获益来自于()

A．抑制交感神经系统

B．抑制肾素-血管紧张素-醛固酮系统

C．减少心室重构

D．减少水钠潴留

E．正性肌力

答案

参考答案：A, B, C

单项选择题

鼻咽癌早期表现不包括（）

A.咽隐窝处小脓块； 

B.横轴位显示优于矢状位； 

C.T1加权像优于T2加权像； 

D.肿瘤明显增强； 

E.可向深部浸润。
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单项选择题

Which of the following statements about object oriented database is not correct

A．Each object has a unique object identity in the syste

B．Encapsulation and inheritance are two important features of object oriented database

C．A subclass can inherit the attributes and methods of all its superclasses

D．A superclass includes the attributes and methods of all its subclasses
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