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问题 问答题 简答题

随着季节变化而南北迁移的鸟类统称之为什么？

答案

参考答案：

随着季节变化而南北迁移的鸟类统称之为候鸟。

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.

School Watch can help its members ______.

A．save the environment

B．organize sports activities

C．improve the quality of school life

D．do home work
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多项选择题

下列关于结构构件的强度的说法正确的有______。

A．在一定荷载作用下，强度低的材料比较坚固，不易破坏

B．在一定荷载作用下，强度高的材料不够坚固，容易破坏

C．钢材的强度高于木材

D．任何构件都不允许在正常工作情况下破坏

E．房屋中的楼板梁，当其强度不足时，在楼板荷载作用下就可能断裂
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