男性,75岁,吸烟50年,15支/天。近2个月出现刺激性咳嗽,有时痰中带血,左胸痛。X线胸片示左上叶前段3cm×4.5cm块影,呈分叶状,边缘有短毛刺,初步诊断()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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