诊断COPD的标准是() A: AFEV<sub>1</sub>/FVC<50% B: BFEV<sub>1</sub>/FVC<60% C: CFEV<sub>1</sub>/FVC<70% D: DFEV<sub>1</sub>/FVC<80% E: EFEV<sub>1</sub>/FVC<90%
诊断COPD的标准是() A: AFEV<sub>1</sub>/FVC<50% B: BFEV<sub>1</sub>/FVC<60% C: CFEV<sub>1</sub>/FVC<70% D: DFEV<sub>1</sub>/FVC<80% E: EFEV<sub>1</sub>/FVC<90%
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