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【简答题】
关系数据库设计理论中主要包括三个方面的内容，其中起核心作用的是_______ 。在关系模型的完整性约束中，实体完整性规则是指关系中_____。
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举一反三
【单选题】embroider
A.
to decorate cloth with a type of material or design along its edges
B.
to decorate cloth with a pattern of stitches usually using colored thread
C.
to decorate clothes or curtains with twisted threads
【单选题】Which of the following are true of the first metal coins?
A.
They were made of copper.
B.
They were made of paper.
C.
They were square but with a round hole in the center.
D.
They were round but with a square hole in the center.
【单选题】查看材料
A.
They were made for earning a living．
B.
They were delicate geometric figures．
C.
They were small circus figures made of wire．
D.
They were collected by a number of museums．
【简答题】B Most musicians agree that the best violins were first made in Italy．They were made in Cremona, Italy, about 200 years ago．These violins sound better than any others．They even sound better than violi...
【单选题】A)They were produced on the assembly line. B)They were built with less costly materials. C)They were modeled after British cars. D)They were made for ordinary use.
A.
B.
C.
D.
D
【简答题】阅读理解。 Most musicians agree that the best violins were first made in Italy. They were made in Cremona, Italy, about 200 years ago. These violins sound better than any others. They even sound better tha...
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