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【单选题】
You've probably had the experience of having someone fall in love with you when you didn't feel the same way. In such a case it's hard to know what to do. You don't want to be so obvious in your efforts that you make an enemy of him. A friend of mine had this problem and handled it in the most tactful (得体的) way I've ever seen. Instead of telling her admirer directly, she devoted herself to introducing him to every girl she knew. Whenever she had a date with him, she arranged to drop in at the home of one of her girl friends. At last he clicked (一见如故) with one of these girls, and then everyone was happy. My friend was rid of a problem and she still had the young man as a friend, which was just what she wanted him to be. Of course this solution may not work for you. You may have your own way of dealing with the problem. But whatever you decide to do, keep one thing in mind—the boy in question has feelings every bit as sensitive as your own. So try to find a way of discouraging him without hurting him. The best title for this passage would be______.
A.
How to Make a Friend
B.
Problems of Dating
C.
Good Advice for Girls
D.
How to Free Yourself from an Admirer
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参考答案:
举一反三
【单选题】关系模型中三类完整性约束分别是实体完整性、()和用户定义完整性。
A.
系统完整性
B.
操作完整性
C.
参照完整性
D.
关系完整性
【单选题】体重,质软,手捻能碎;断面易纵向断裂,纵断面具绢丝样光泽,可见纤维纹理。无臭,味淡。此药材是
A.
白矾
B.
滑石
C.
石膏
D.
芒硝
【判断题】关系模式的三类完整性约束条件分别是实体完整性约束、参照完整性约束和域完整性约束。
A.
正确
B.
错误
【简答题】关系模式的三类完整性约束条件分别是实体完整性、参照完整性约束和 ______。
【单选题】Why does the author say that it was the artists who kept the keys in Paragraph 6?
A.
To show that the artists play a very important role in lifting the souls of people and thus enabling people to have a pure life.
B.
To demonstrate that artists and their paintings should serve as a bridge between the universal mind and the mind of humans.
C.
To prove that artists were very important in expressing the themes of the Hudson River paintings.
D.
To state that artists should have a broad knowledge of the Bible in order to fully depict the themes of the Hudson River paintings.
【判断题】对于微波频段,电流和电压的测量和低频电路相似
A.
正确
B.
错误
【简答题】什么是实体完整性约束、参照完整性约束和用户定义的完整性约束(域完整性约束)?
【简答题】关系模型的三类完整性规则是实体完整性、______和用户定义完整性。
【简答题】什么是实体完整性?可以通过哪些方法来实现实体完整性规则?
【判断题】关系模型提供了3类完整性,分别是实体完整性、参照完整性、域完整性。( )
A.
正确
B.
错误
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