患者,男,25岁,节律性间断上腹隐痛3年,加重2天,10小时前开始黑便3次,量约1000g左右,P 120 次/分,Hb90g/L,首选下列哪种治疗
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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