【简答题】【消耗次数：1】
数据库体系结构按照模式、[填空]和内模式三级结构进行组织。
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【简答题】
数据库系统的三级模式结构是指数据库系统是由[填空1]、内模式和外模式 三级构成。
随机题目
【单选题】
There’s little chance that mankind would _____ a nuclear war.
①
retain
②
endure
③
maintain
④
survive
【单选题】
The scientific quest is grounded in reason and ____ inference from known facts.
①
logic
②
practical
③
magical
④
logical
【单选题】
He left in such a hurry that I _______ had time to thank him.
①
almost
②
even
③
hardly
④
nearly
【单选题】
Eggs, though rich in nourishments, have _______ of fat.
①
a large number
②
the large number
③
a large amount
④
the large a mount
【单选题】
I’m sorry to break your glasses.____________
①
It doesn’t matter.
②
What a pity! I’m sorry.
③
The same to you.
④
Thanks.
【判断题】
判断线上的内容是否正确：—Can you tell us your __recipe___ for happiness and a long life? —Living every day to the full, definitely.
①
正确
②
错误
【单选题】
Could you be so kind as to turn down that rock “n” roll? I am preparing for tomorrow’s exam.____________
①
It’s none of your business.
②
What are you doing?
③
Sure. Sorry to disturb you.
④
No, I don’t think so.
【单选题】
May I use your bike for a moment?___________
①
It’s well.
②
It doesn’t matter.
③
By all means.
④
I have no idea.
【单选题】
We’ve _______ paper and ink. Ask Mr. Howard to lend us some.
①
run away with
②
run down
③
run off
④
run out of
【单选题】
How do I get to the cinema?____________
①
Its very far.
②
Yes, there is a cinema near here.
③
Its well known.
④
Go down this street and turn left.