男,16岁,胸骨左缘3、4肋间闻及响亮的收缩期杂音,震耳,伴有震颤,但听诊器离开胸壁听不到。若该患者发生心衰,则杂音()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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