A.吸入支气管扩张剂后,FEV1/FVC<70%,FEV1≥80% B.吸入支气管扩张剂后,FEV1/FVC<70%,50%≤FEV1<80% C.吸入支气管扩张剂后,FEV1/FVC<70%,30%≤FEV1<50% D.吸入支气管扩张剂后,FEV1/FVC<70%,FEV1<30%,或FEV1<50%且伴有慢性呼吸衰竭