皮皮学，免费搜题
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【单选题】
患者,男,16岁,支气管哮喘1年。未发现早期哮喘发作,建议病人家属为其选择的最简便易行的方法是:A.
临床观察
B.
血氧饱和度测定
C.
支气管舒张试验
D.
峰流速（PEF）测定
E.
第一秒用力呼气量（FEV1）测定
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