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【多选题】
具有现代意义的旅行和旅游活动首先在( )出现
A.
古中国
B.
美国
C.
英国
D.
古印度
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皮皮学刷刷变学霸
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【判断题】演示法就是通过学生的尝试操作来概括出典型本质特征的一种教学方法。
A.
正确
B.
错误
【简答题】设有关系R、S和T如下。关系T是由R和S经过什么操作得到的?
【简答题】Cities usually have a good reason for being where they are, like a nearby port or river. People settle in these places because they are easy to get to and naturally suited to communications and trade....
【简答题】设有关系R、S和T如下。关系T是由R和S经过什么操作得到的?
【简答题】完型填空。 Bruce likes playing 1 a river. But there 2 a river near his new house. He is not very happy. One day, he asks 3 mother,' 4 a river near here?''No, there 5 ',his mother says, 'But 6 new house has...
【单选题】在管壳式换热器中,粘度大的液体或流量较小的流体宜走(),因流体在有折流挡板的壳程流动时,由于流速和流向的不断改变,在低Re值(Re>100)下即可达到湍流,以提高对流传热系数。
A.
管内
B.
管间
C.
管径
D.
管轴
【简答题】Cities usually have a good reason for being where they are, like a nearby port or river. People settle in these places because they are easy to get to and naturally suited to communications and trade....
【简答题】阅读理解。 A frog (青蛙) is born in a small river.When he is young,the river is his home.He doesn't know his parents,but he has hundreds of brothers and sisters.He swims about and plays with them all the tim...
【简答题】编写程序,统计文件 file.txt 中内容的行数和字符数。
【判断题】上海地处太平洋西岸,东濒黄海,南临杭州湾。
A.
正确
B.
错误
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