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[单选题]
中国商飞出品的第一款商用客机是()
A.C919
B.A919
C.运10
D.运20
提问人:网友lixin080108
发布时间:2022-01-07
A.C919
B.A919
C.运10
D.运20
B.to find out whether students do part-time jobs or not
C.to figure out why students increase or decrease their working hours
D.to assess the effects of working on students’ school performance
B.经粪口传播,水源被患者或带菌者污染可引起菌痢暴发流行
C.人群普遍易感,感染后无持久免疫力,故易反复感染
D.为消化道传染病,夏秋季多发
E.发达国家多发
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