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【简答题】
对于主键字段,除了不允许_____之外,还不允许_________。
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反馈参考答案：
举一反三
【单选题】Choose the best summary of the passage.
A.
There are two types of judgment which are made about people. Most of them are not concerned about the type of person we are, but are made for some other reason, such as to provide members for an organization, like a team, a company or a college. So if we are not chosen in these circumstances, we shouldn’t feel hurt about it.
B.
It is more useful to think of someone who has to select people (for a job, for example, or for admission to a college) as a customer rather than as a judge. This is because there is never anything “personal” about selecting someone for a prize, or a team. Rather, the process of selecting people is more like a business transaction, and it is vital not to make a mistake.
C.
We are constantly involved in judging other people. Most of the time this is not in any formal situation, such as a law court, but informally, at work or school, or even when we are looking for a partner to date. But there are two types of judgment – good or bad – and if we make a wrong judgment we will probably regret it.
【简答题】编程,实现D1、D2双灯交替亮灭
【判断题】If two team members have conflicts, they’d better not take part in meeting.
A.
正确
B.
错误
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