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问题 单项选择题

患者女性，60岁，反复出现呼吸困难、心绞痛和晕厥，该患者首先考虑

A．主动脉瓣关闭不全

B．主动脉瓣狭窄

C．房间隔缺损

D．二尖瓣狭窄

E．二尖瓣关闭不全

答案

参考答案：B

单项选择题

The schema theory is an important element in ______ , which is "action-based", more concerned with the process of learning than what is learnt.

A. Brunner's method


B. Ausubel's theory
C. Kelly's theory



D. Piaget's theory
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单项选择题

哪一年成立了国际民航组织（）

A.1947

B.1944

C.1939

D.1946
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