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【单选题】
可引起第二心音A2增强的是（）
A.
动脉粥样硬化
B.
主动脉瓣狭窄
C.
主动脉瓣关闭不全
D.
肺动脉高压
E.
左心功能不全
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】第二篇 Sleep We all know that the normal human daily cycle of activity is of some 7 - 8 hours’ sleep alternating with some 16 - 17 hours’ wakefulness and that, broadly speaking, the sleep n...
A.
people hate the inconvenience of working on night shifts.
B.
your life is disturbed by changing from day to night routines and back.
C.
not all industries work at the same hours.
D.
it is difficult to find a corps of good night workers.