男,61岁。乏力伴食欲减退半年余。体重下降约11kg,间断出现黑便,突然呕吐暗红色血液,量约300ml。查体:上腹部饱满,轻压痛,肝脾未触及,移动性浊音(-)。最具有诊断意义的检查是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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