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【单选题】
男性，35岁。反复发作性呼吸困难、胸闷、咳嗽3年，每年春季发作，可自行缓解。此次已发作1天，症状仍持续加重，听诊：双肺布满哮鸣音，心率88次／分，律齐，无杂音。给予足量特布他氨茶碱治疗1天，病情无好转，呼吸困难加重，唇发绀，此时应采取（）A.
原有药物加大剂量再用1天
B.
大剂量二丙酸倍氯米松吸入
C.
静脉滴注头孢菌素
D.
静脉滴注5%碳酸氢钠
E.
静脉滴注琥珀酸氢化可的松
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