多选题：关于第二心音产生的叙述，正确的是(　　)

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题目内容：
关于第二心音产生的叙述，正确的是(　　) A．主动脉瓣关闭时的振动
B．肺动脉瓣关闭时的振动
C．主动脉及肺动脉壁开始部分受血流冲击所产生的振动
D．房室瓣开放的振动
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