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１９９７年１０月１２日晚６时，全国某会议代表９０人，在某宾馆就餐，晚８时一位代表出现上腹部不适、恶心、呕吐等症状，到１０月１３日上午１０时，共有１８人出现上述症状，其中５人病重住院。经临床治疗均病愈出院。现将检测结果报告如下。１ 材料与方法１１ 样品来?
At 6 pm on October 12, 1997, there were 90 delegates from a certain conference in the country who dined at a hotel. At 8 pm, one representative showed symptoms of upper abdominal discomfort, nausea and vomiting. By October 10 at 10 a.m., a total of 18 People have the above symptoms, of which 5 were seriously ill in hospital. After clinical treatment were discharged. The test results are reported below. 1 Materials and Methods 1 1 samples come?