S4的产生机制是()A、二尖瓣突然关闭B、三尖瓣突然关闭C、血流冲击心室壁D、心房收缩E、主动脉瓣突然关闭

S4的产生机制是()

  • A、二尖瓣突然关闭
  • B、三尖瓣突然关闭
  • C、血流冲击心室壁
  • D、心房收缩
  • E、主动脉瓣突然关闭

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