患者女性,35岁,患有风湿热10年,常有扁桃体炎发生,经医生诊断为慢性风湿性心瓣膜病、二尖瓣狭窄,二尖瓣狭窄最早出现的症状是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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