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【单选题】
根据关系的完整性规则,一个关系中的主键
A.
不可能有两个
B.
不可以作为其他关系的外部键
C.
可以取空值
D.
不可以是属性组合
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参考答案：
参考解析：
知识点：
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举一反三
【单选题】Read Text B of Unit 6 in sense groups, and then complete the following questions. What are the two major means by which institutions obtain external financing?
A.
Equity and funding.
B.
Debt and capital.
C.
Deposits and loans.
D.
Debt and equity.
查看完整题目与答案
【简答题】闲暇时间是指人们在工作时间和生活时间之间以外的,可以( )的,用来从事娱乐、消遣、社交或者其他自己所感兴趣事情的时间。
查看完整题目与答案
【多选题】下列物品中,禁止出境的是( )
A.
涉及国家秘密的手稿
B.
珍贵文物
C.
濒危的和珍贵的动物
D.
印刷品
E.
濒危的和珍贵的植物标本
查看完整题目与答案
【简答题】However, despite the __________________ of culture and value systems, the ___________________of a culture is _________ to change.
查看完整题目与答案
【多选题】下列物品中,禁止出境的是。
A.
涉及国家秘密的手稿
B.
珍贵文物
C.
濒危的和珍贵动物
D.
印刷品
E.
濒危的和珍贵动物标本
查看完整题目与答案
【判断题】只需要看视频就可以获得最终学分()
A.
正确
B.
错误
查看完整题目与答案
【判断题】闲暇时间是指人们在工作时间和生活时间之间以外的,无事可干的时间。
A.
正确
B.
错误
查看完整题目与答案
【单选题】However, despite the greatly improved efficiency of bigdata diagnosis, the doctors' skills and experience are still necessary when images are difficult to ______________ and a final decision has to be...
A.
infect
B.
implement
C.
interrogate
D.
interpret
查看完整题目与答案
【单选题】Read the text B in Unit 2 and choose the best answer to each of the following questions. 1. Why does the daughter find it difficult to help her father stand up?
A.
Because he is tired.
B.
Because he has hurt one of his legs.
C.
Because he is heavy and weak.
查看完整题目与答案
【简答题】The temperature of the Sun is over 5,000 degrees Fahrenheit at the suce, but it rises to perhaps more than 16 million degrees at the center. The Sun is so much hotter than the Earth that matter ca...
查看完整题目与答案
相关题目：
【单选题】Read Text B of Unit 6 in sense groups, and then complete the following questions. What are the two major means by which institutions obtain external financing?
A.
Equity and funding.
B.
Debt and capital.
C.
Deposits and loans.
D.
Debt and equity.
查看完整题目与答案
【简答题】闲暇时间是指人们在工作时间和生活时间之间以外的,可以( )的,用来从事娱乐、消遣、社交或者其他自己所感兴趣事情的时间。
查看完整题目与答案
【多选题】下列物品中,禁止出境的是( )
A.
涉及国家秘密的手稿
B.
珍贵文物
C.
濒危的和珍贵的动物
D.
印刷品
E.
濒危的和珍贵的植物标本
查看完整题目与答案
【简答题】However, despite the __________________ of culture and value systems, the ___________________of a culture is _________ to change.
查看完整题目与答案
【多选题】下列物品中,禁止出境的是。
A.
涉及国家秘密的手稿
B.
珍贵文物
C.
濒危的和珍贵动物
D.
印刷品
E.
濒危的和珍贵动物标本
查看完整题目与答案
【判断题】只需要看视频就可以获得最终学分()
A.
正确
B.
错误
查看完整题目与答案
【判断题】闲暇时间是指人们在工作时间和生活时间之间以外的,无事可干的时间。
A.
正确
B.
错误
查看完整题目与答案
【单选题】However, despite the greatly improved efficiency of bigdata diagnosis, the doctors' skills and experience are still necessary when images are difficult to ______________ and a final decision has to be...
A.
infect
B.
implement
C.
interrogate
D.
interpret
查看完整题目与答案
【单选题】Read the text B in Unit 2 and choose the best answer to each of the following questions. 1. Why does the daughter find it difficult to help her father stand up?
A.
Because he is tired.
B.
Because he has hurt one of his legs.
C.
Because he is heavy and weak.
查看完整题目与答案
【简答题】The temperature of the Sun is over 5,000 degrees Fahrenheit at the suce, but it rises to perhaps more than 16 million degrees at the center. The Sun is so much hotter than the Earth that matter ca...
查看完整题目与答案