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问题 填空题

平面插图中的图解形式(diagrams)是一种极适合用来表现______的插图形式。

答案

参考答案：复杂产品

单项选择题

A


Hello,everyone. Because of the high rate of school violence(力)in some areas, teenagers’ safety becomes a serious problem. We are planning to set up an organization named School Watch to make sure that students have a safe school environment. Please be part of our plan!
What is School Watch
School Watch is a volunteer project in our school. It helps us stop violence and improve the quality of school life. It will keep yourself and your schoolmates safe. The other members of School Watch care for you and your classroom and you do the same for them.
Is it for everyone
Anybody can become a member of School Watch because everyone has something to offer.
What else can it do
School Watch makes it possible for us not only to help each other But also to make friends with each other. Some members may offer to help schoolmates who have problems with their homework.
Who is the Best School Watcher
Our school will look for the Best School Watcher and give him or her lots of prizes. You could be the one !
How do you start
To be part of this plan, the only thing you need to do is to talk to the director of the plan in your grade. If you want to get more information, check the official website at www.schoolwatch.com.

The members of School Watch are probably ______.

A．teenagers

B．parents

C．policemen

D．doctors
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单项选择题

数据库中有A、B两表，均有相同字段C，在两表中C字段都设为主键。当通过C字段建立两表关系时，该关系为

A．一对一

B．一对多

C．多对多

D．不能建立关系
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