患者,女,24岁。5年前诊断为支气管哮喘。近4个月每天均感胸闷,夜间发作2〜3次/周。肺功能检查示FEV1占预计值的70%。其病情分级属于
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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