患者男性,18岁,腹泻近1月,每天3~4次,有黏液,常有里急后重,伴腹部疼痛,便后疼痛减轻。查体:左下腹轻压痛,余无特殊。进一步确诊有重要价值的检查是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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