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【判断题】
图线是构成图形的基本元素。
A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【单选题】The current ______steady and strong, for the boat kept moving forward smoothly.
A.
can't have been
B.
needn't have been
C.
must have been
D.
should have been
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【单选题】一个关系模式 R∈ 3NF 是指关系模式中 ( ) 。
A.
R∈1NF，且不 存在多值依赖
B.
R中 不存在部分依赖
C.
R∈1NF，且 不存在传递依赖
D.
R中只有一个候选码
查看完整题目与答案
【单选题】Sorry, I can't bring () any proof of my story.
A.
on
B.
up
C.
about
D.
forward
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【简答题】根据句意及首字母补全单词，使句意完整。 1. Why didn't you come to my birthday party? Because I had a music l________. 2. This pair of shoes is too big. Do you h ave  a________ pair? 3. There is going to be a piano c_____...
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【简答题】学生关系模式如下: 学生(学号,姓名,性别,电话,系部,系主任,课程号,课程名称,成绩) (1) 学生关系的主码是什么? (2) 分析其中的函数依赖,判断 学生关系是2 NF 吗?为什么? (3) 如果学生关系不是2NF,通过模式分解,将其转化2NF的关系模式 (4) 如果(3)转化后的关系模式不是3NF,将其转化为3NF 的关系模式。
查看完整题目与答案
【单选题】All of us are looking forward to _____ a trip to the Ming T ombs.
A.
make
B.
making
C.
to making
D.
have made
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【简答题】将2NF的关系模式转变为3NF的关系模式，是消除了______。
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【单选题】—I don't like the plan they put forward. You have never______ it, haven't you? —______, I seriously doubt its future. [     ]
A.
approved of; No
B.
agree with; Yes
C.
judged; No
D.
supported; Yes
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【单选题】The students are looking forward to a good result in the final examination, aren’t they?
A.
getting
B.
have
C.
has
D.
get
查看完整题目与答案
【单选题】关系模式中3NF是指
A.
满足2NF且不存在非主属性对关键字的传递依赖现象
B.
满足2NF且不存在非主属性对关键字部分依赖现象
C.
满足2NF且不存在非主属性
D.
满足2NF且不存在组合属性
查看完整题目与答案
相关题目：
【单选题】The current ______steady and strong, for the boat kept moving forward smoothly.
A.
can't have been
B.
needn't have been
C.
must have been
D.
should have been
查看完整题目与答案
【单选题】一个关系模式 R∈ 3NF 是指关系模式中 ( ) 。
A.
R∈1NF，且不 存在多值依赖
B.
R中 不存在部分依赖
C.
R∈1NF，且 不存在传递依赖
D.
R中只有一个候选码
查看完整题目与答案
【单选题】Sorry, I can't bring () any proof of my story.
A.
on
B.
up
C.
about
D.
forward
查看完整题目与答案
【简答题】根据句意及首字母补全单词，使句意完整。 1. Why didn't you come to my birthday party? Because I had a music l________. 2. This pair of shoes is too big. Do you h ave  a________ pair? 3. There is going to be a piano c_____...
查看完整题目与答案
【简答题】学生关系模式如下: 学生(学号,姓名,性别,电话,系部,系主任,课程号,课程名称,成绩) (1) 学生关系的主码是什么? (2) 分析其中的函数依赖,判断 学生关系是2 NF 吗?为什么? (3) 如果学生关系不是2NF,通过模式分解,将其转化2NF的关系模式 (4) 如果(3)转化后的关系模式不是3NF,将其转化为3NF 的关系模式。
查看完整题目与答案
【单选题】All of us are looking forward to _____ a trip to the Ming T ombs.
A.
make
B.
making
C.
to making
D.
have made
查看完整题目与答案
【简答题】将2NF的关系模式转变为3NF的关系模式，是消除了______。
查看完整题目与答案
【单选题】—I don't like the plan they put forward. You have never______ it, haven't you? —______, I seriously doubt its future. [     ]
A.
approved of; No
B.
agree with; Yes
C.
judged; No
D.
supported; Yes
查看完整题目与答案
【单选题】The students are looking forward to a good result in the final examination, aren’t they?
A.
getting
B.
have
C.
has
D.
get
查看完整题目与答案
【单选题】关系模式中3NF是指
A.
满足2NF且不存在非主属性对关键字的传递依赖现象
B.
满足2NF且不存在非主属性对关键字部分依赖现象
C.
满足2NF且不存在非主属性
D.
满足2NF且不存在组合属性
查看完整题目与答案