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【判断题】
对于每一个外模式,数据库系统都有一个外模式/模式映像,它定义了该外模式与模式之间的对应关系。A.
正确
B.
错误
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举一反三
【判断题】Prof. Weston taught Jenny American novel last semester.4：Prof. Weston taught Jenny American novel last semester.
A.
正确
B.
错误
【单选题】In this passage, 'the American paradox' probably means ______ (Line 1, Para. 4).
A.
the American characteristic
B.
the American contradiction
C.
the American miracle
D.
the American phenomenon
【单选题】What is the main idea of the passage?
A.
The Declaration of Independence and the French Revolution.
B.
The Declaration of Independence's influence on other countries.
C.
The Application of the Declaration of Independence by different people.
D.
The different purposes of the Declaration of Independence intended by its authors.
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