A.應(yīng)用抗生素預(yù)防感染 B.長(zhǎng)期服用祛痰止咳藥 C.長(zhǎng)期應(yīng)用解痙平喘藥 D.長(zhǎng)期吸入糖皮質(zhì)激素 E.進(jìn)行呼吸肌功能鍛煉