【判断题】【消耗次数：1】
数据模型的三要素是数据操作、数据结构、完整性约束。
①
正确
②
错误
参考答案：
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相关题目
【简答题】
关系数据模型的三要素是[填空]、关系操作和完整性约束条件。
【单选题】
数据模型三要素是指（ ）。
①
数据结构、数据对象和数据共享
②
数据结构、数据操作和数据完整性约束
③
数据结构、数据操作和数据的安全控制
④
数据结构、数据操作和数据的可靠性
随机题目
【单选题】
All the men were under heavy____ working day and night
①
prize
②
rain
③
pressure
④
reward
【单选题】
—I’ve got an offer in New York. —Oh, ____! But I’m going to miss you.
①
That’s too bad
②
I’m sorry
③
I beg your pardon
④
That’s great
【单选题】
The ____child was learning to walk again gradually.
①
broken
②
harmed
③
injured
④
enable
【单选题】
You never told us why you were one hour late for the last meeting, ____?
①
weren’t you
②
didn’t you
③
have you
④
did you
【单选题】
Rapid reading means reading something fast just to ____ the general idea.
①
master
②
seize
③
grasp
④
imagine
【单选题】
_______ he tried his best, he still failed the examination.
①
Although
②
Even although
③
However
④
Because
【单选题】
____ from space, our earth, with water covering 70% of its surface, appears as a “blue planet”.
①
Seeing
②
To be seen
③
Seen
④
Having seen
【单选题】
Now we may be able to say ____ between music and noise.
①
that what the difference
②
what the difference is
③
the difference is what
④
what is the difference
【单选题】
Frankly speaking, I’d rather you ____ anything about it for the time being.
①
didn’t do
②
don’t do
③
will not do
④
do