由关系数据库系统支持的完整性约束是指 ______ 和参照完整性。_爱下问搜题

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问题填空题

由关系数据库系统支持的完整性约束是指 ______ 和参照完整性。

答案

参考答案：实体完整性

单项选择题

患龋率最低的是（）。

A.上颌前磨牙

B.上颌磨牙

C.上颌前牙

D.下颌前磨牙

E.下颌前牙

完形填空

Perhaps what we like most about the successful man who has a sense of humor is that he doesn't seem to take himself too 36 . The average person expects the man in a powerful   37  to be too vain and self-centered. “Walt Dizzy is just a plain, ordinary guy. It's absolutely amazing,” Harvey tells his friends, “He's really not different from any one of us. Boy, I'll tell you, success didn't spoil him.”   38 it was Walt Dizzy's aptitude for making the people around him feel 39 that relaxed everyone who met him and gave people the impression that he’s “one of the boys’’.
It's always a surprise and a   40  when people discover that successful individuals are basically not different from anyone else. The majority of people   41   highly successful men and women to be very solemn and earnest because they   42 such big decisions. An executive who has a relaxed   43   and good sense of humor leaves a favorable impression. You've undoubtedly often heard someone say,  44   discussing one of these tycoons(大人物), “I can identify with him.” The party who makes the remark has absolutely    45  in common with the tycoons, but the    46  atmosphere, not the man himself, becomes the means of identification.
Greeting someone  47   whom you are about to do business with a warm smile is the best way to introduce yourself. People can't  48   immediately liking such an individual. He seems humble, and they're impressed with his informal manner. They notice his “human side,” and he   49   them over at once. People want to cooperate with this kind of man. A   50   first meeting sets the stage beautifully for the formal discussions.
On the other hand, there's the humorless, dull type who turns you completely   51   .Stanley Shtick, president of a large food company, is a good   52 . “He is the coldest fish I’ve 53    met,” says Zelda Zoftik, “You would think he was the King of England, the way he acts,” she 54 . “The longer it is before I meet with him again, the   55  .”

C．comfortable

C．personality

D．embarrassed