男性,56岁,体检发现右下肺3cm×3.5cm球形病灶,边缘毛糙,略显分叶,拟诊肺癌。下列检查对肺癌没有确诊价值的是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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