患者，女,24岁。干咳1周，从口腔中排出鲜红色血液50ml,半小时后来院门诊。查体示:T37.8℃,右上肺呼吸音减弱，心脏听诊无杂音，无胸痛，剑突下轻压痛。排出血液pH值检查呈碱性反应。最可能的诊断是

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