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【单选题】
关系模式的完整性规则，一个关系中的“候选码”（）A.
不能有两个
B.
不能成为另一个关系的外码
C.
不允许为空
D.
可以为空值
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反馈参考答案：
举一反三
【判断题】For the following argumentative topics of A “Are you one of those who thinks cheating is not good for students?” and B “Cheating helps students learn”, A is better, for aquestion can be an argument.
A.
正确
B.
错误
【单选题】( ) has been recorded, those students frequently ( ) with their teachers will stand a good chance of achieving academic excellence.
A.
What; interacted
B.
As; interacted
C.
What; interacting
D.
As; interacting
【单选题】For those who do not do well on “A Level”s but are good students, there is an _______.
A.
option
B.
alternative
C.
choice
D.
equivalent
【判断题】For the following argumentative topics of A “Are you one of those who thinks cheating is not good for students?” and B “Cheating helps students learn”, A is better, for a question can be an argument.
A.
正确
B.
错误
【简答题】Now many university teachers are troubled by students' cheating on exams. No matter how hard they try to persuade and to pr it from happening, this phenomenon seems to be on the increase. In the ...
【简答题】Good students are those who not only read books but_________________what they learn from them.
【单选题】Those good students don't have ___.
A.
to make to learn
B.
to be made to learn
C.
to make learnt
D.
to make learn
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