男,28岁,间断咳血3年,本次因抬重物后突然出现咯血200ml。查体双下肺湿啰音,胸片检查双下肺纹理增多、粗乱,提示最可能的病因是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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