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【单选题】
沙门氏菌食物中毒在食物中毒发生问题上占有重要位置，某地发生一起760人大型食物中毒，报告潜伏期8-24小时，临床症状：恶心，头痛，食欲不振，出冷汗，呕吐，腹泻，腹痛，体温升高达38℃。检查沙门氏菌中毒，确证诊断必须要达到以下何要求（）A.
可疑食物，病人粪便或呕吐物检出的沙门氏菌菌型一致
B.
病人粪便检出沙门氏菌即可
C.
病人呕吐物检出沙门氏菌即可
D.
现场涂抹样品检出沙门氏菌即可
E.
可疑食物，病人粪便或呕吐物检出的沙门氏菌菌型不一致也可以
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【简答题】We chatted for half an hour before he finally got _____ the point: He wanted to work as a business consultant and wondered if I could pass along the names of certain potential s.
【单选题】We chatted for half an hour before he finally _______ : He wanted to work as a business consultant and wondered if I could pass along the names of certain potential clients.
A.
made his point
B.
got to the point
C.
carried his point
D.
proved his point
【单选题】We chatted for half an hour before he finally______: he wanted to work as a business consultant and wondered if i could pass along the names of certain potential clients.
A.
get to the point
B.
got to the point
C.
gets to the point
【单选题】Yesterday I came across a friend of mine on the street and we chatted for half an hour. You know, it's months _____ we met again. [ ]
A.
before
B.
since
C.
that
D.
after
【单选题】对乙烯合成低密度聚乙烯和高密度聚乙烯的聚合反应机理,描述正确的是( )。
A.
均为自由基聚合
B.
均为离子聚合
C.
前者是离子聚合，后者为自由基聚合
D.
前者是自由基聚合，后者为离子聚合
【简答题】合成高密度聚乙烯的机理是
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