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【单选题】
以下说法错误的是A.
表是数据库的基本元素
B.
表中的数据可以整行互换，任意排列
C.
表中不能有完全相同的两行数据
D.
一个数据库里只能由一张表
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【多选题】On the New Year's Day, people in ______ clean their houses.
A.
the Netherlands
B.
Iran
C.
China
【单选题】一只电阻值为 R 的电阻丝,两端电压为 U 时,通过的电流为 I ,若将该电阻两端电压变为 2U ,则电阻的阻值和通过它的电流分别是 ( )
A.
2R ， 2I
B.
R ， I
C.
2R ， I
D.
R ， 2I
【简答题】完形填空。 Jim is the son of a farm owner. One New Year's Day, when he was 15 years old, his father 1 him to work on the farm for one year at his free time. Jim was 2 with his father's idea. 'That isn't my...
【简答题】完形填空 The Spring Festival(春节) is the Chinese New Year's Day. It usually comes 1 February. Everyone in China 2 the Spring Festival very much. When the Spring Festival 3 , Li Hong usually 4 his parents c...
【单选题】题 We were overjoyed at the news of China__________ another man-made satel1ite.
A.
starting
B.
1aunching
C.
fighting
D.
shouting
【简答题】根据所给首字母填空。 The Spring Festival is the Chinese New Year's D 1 . It usually comes in F 2 . Everyone in China l 3 the Spring Festival. When the Spring Festival comes, Li Lei usually h 4 his parents clean...
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【多选题】On the New Year's Day, people in ______ clean their houses.
A.
the Netherlands
B.
Iran
C.
China
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