男性,72岁,哮喘史40年,近5年来发生双下肢水肿,1周来哮喘加重,咳黄痰,1天中白天嗜睡,夜间失眠下列在支气管哮喘的诊断中最有意义的是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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