题目内容

COPD的严重程度分级是依据下列哪项肺功能指标进行的？

A. 第一秒用力呼气容积与用力肺活量比(FEV1/FVC)
B. 第一秒用力呼气容积与预计值比(FEVJ预计值)
C. 残气量与肺总量比(RV/TIE)
D. 呼气相峰流速(PEF)
E. 肺活量(VC)

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