单选题:对于慢性阻塞性肺气肿的诊断,下列哪项最有价值(  )

题目内容:
对于慢性阻塞性肺气肿的诊断,下列哪项最有价值(  ) A.Pa0.低于正常
B.用力肺活量减低
C.潮气量低于正常
D.残气量与肺总量比(RV/TLC)大于40%
E.PaC02降低
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