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【判断题】
生态旅游业是旅游业的一个分支。A.
正确
B.
错误
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举一反三
【单选题】Competitors complain that Microsoft's recent settlement of their antitrust case with the federal government will do little to protect them or consumers from the software giant's monopoly power. But th...
A.
to restrict the expansion of software companies
B.
to limit the reach of Microsoft's Windows operating system
C.
to prevent Microsoft from monopolizing the computer software industry
D.
to assist its competitors in making products compatible with Windows
【单选题】If a customer wants a quick settlement of his or her problem, it's better to complain to ______.
A.
the store manager
B.
a shop assistant
C.
the producer
D.
a public organization
【多选题】下列关于关系的叙述中，哪些是正确的——
A.
任意的一个二维表都是一个关系
B.
在关系中，元组的顺序是无关紧要的
C.
表中任意两列的值不能相同
D.
任意两个元组不允许重复
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