题目内容
数据库备份和还原操作可以保存和恢复数据库中的数据。
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一个数据库中可以包含多张数据表。
在关系型数据库中,可以通过主键唯一标识一条记录。
Read the following passage and then finish the exercises.1) The expression “in the dock” means______.
Fill in the blanks with proper prepositions.a. It is a right fiercely fought _____, and fiercely defended at those times when its powers have been seen to be _____ threat.b. _____ being directed to by the judge and subjected _____ imprisonment, the jury refused to convict the Quaker of “leading a dissident form of worship”.
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