患者男,46岁。回吸性血涕3个月。查体:锁骨上可触及肿大淋巴结。穿刺细胞学示"转移性鳞癌"。为明确原发灶,该患者应该首先进行的检查是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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