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未知题型

社会调查数据资料的检验方法主要有经验检验、逻辑检验和( )。

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计算检验

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多项选择题

二叉树的先序遍历和中序遍历如下：先序遍历：ABCDE；中序遍历: BCAED 。以下结论正确的是（）。
A、A是根结点
B、B和D结点在同一层
C、D是A的左孩子
D、D是E的双亲结点

单项选择题

计算机中的信息不仅包括数字或字符，还包括声音、图形、图像、视频等。
A、正确
B、错误

未知题型

Tuangou , also called team buying or group buying, is a recently developed shopping strategy starting in ChinA.Several people connect over the Internet and agree to contact a seller of a specific product so that they can buy the same item as a group at a lower pricE.And the sellers benefit by selling many products at oncE.
When people agree on group buying,individual members of the buying group can vouch for ( 替 ……… 担保 )a particular seller’s quality to the rest of the group,therefore Tuangou helps of similar phenomena in Euroupe and North AmericA.However,most of the group buying in these places is organized and done not by the team members themselves,but through online go-betweens. go-betweens.
56. Where did Tudngou begin?
A.In America
B.In Europe
C.In North America
D.In China
Buyers purchase goods as a group in order to_________A.save money
B.connect over the Internet
C.buy different items
D.make friends
The sentence “ therefore Tuangou helps change a traditional distust of goods purchased from unknown sellers” implies that_________A.buyers used to doubt the quality of goods from unknown sellers
B.team buying is a good Chinese tradition
C.team buying is not accepted by people
D.buyers never purchase goods from unknown sellers
Sellers in the group buying benefit by_________A.paying less
B.selling many produdcts at once
C.bargaining with each buyer
D.selling goods at a higher price
What does the word 'go-betweens' mean in the last paragraph?A.Online shopping
B.Going from one place to another
C.Traveling between two places
D.Persons or companies that pass messages between sellers and buyers
请帮忙给出每个问题的正确答案和分析，谢谢！

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