女性,65岁,上腹部隐痛10余年,乏力、食欲不振、体重减轻,间断黑便半年。查体发现左锁骨上窝2cm×3cm淋巴结2个。在检查患者左锁骨上窝淋巴结时正确手法是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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