患者,女性,30岁。消化性溃疡患者,给予奥美拉唑+枸橼酸铋钾+克拉霉素+阿莫西林四联治疗期间出现黑粪,但粪便隐血试验报告为阴性。护士判断患者出现黑便的原因是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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