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【简答题】
Nadia Comane ci,a famous gymnast (体操运动员),was born in Romania in 1961. When she was doing cartwheels(侧手翻)on the playground at the age of 7,a PE teacher saw her. He told her family that she was very good and advised Nadia to train in the capital of Romania. Although it was a long way from her home,Nadia went because she loved gymnastics (体操). After that,she trained hard and took part in lots of competitions.In 1975,she was named as one of the Athletes of the 20th Century. In 1976,Nadia went to the Olympics in Canada. She was so fantastic in the competition that everyone waited for the score, a high score.But the scoreboard showed 1.00! Everyone wassurprised.There wasn't a sound for a moment. Then a voice came,"Ladies and gentlemen,Nadia Comaneci...10!" The audience(观众)cheered very loudly. So what happened?Well,when the scoreboard was built,no one thought a score of 10.00was possible.The decimal point (小数点) was in the wrong place! In fact,the scoreboard only had three digits (数位) to show scores, such as 9.50or 9.85at that time. In the 1976 Summer Olympics,Nadia Comaneci scored a perfect 10,which was thought impossible before.From then on,she was looked as a hero.In 1984, she got retired(退休的).
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A.
text
B.
char(n)
C.
varchar(n)
D.
nvarchar(n)
【单选题】----You didn’t wait for Mr. Smith last night, did you? ---- Yes, but we _______. He didn’t return home at all.
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needn’t have
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should have
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didn’t need to
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don’t have to
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A.
正确
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正确
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A.
正确
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错误
【单选题】—You didn't wait for Mr. Smith last night, did you? —Yes, but we ________. He didn't return home at all.
A.
don't have to
B.
needn't have
C.
didn't need to
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should have
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A.
正确
B.
错误
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A.
couldn’t have
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needn’t have
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didn’t need to
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A.
正确
B.
错误
【多选题】在电商平台数据库中的商品表设计时,以下完整性约束设置合理()
A.
商品名不允许为空
B.
价格<=10< /div>
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设置商品号为主关键字
D.
“是否上架”默认值设置0
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