目前我们调测时钟采用的频率计主要是什么材料构成？（）A、原子 B、铷 C、铯 D、电

一个数加上40%等于28，求这个数．

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

小题1: Many students feel stressed around big moments in their lives like during final exams or when applying to college. Stress can be a pretty dangerous thing, because it can cause you to become sick.. Here are some ways to cope with stress:

Laugh   Laughter is really one of the best medicines. When things get stressful, do things that make you laugh. Watch a funny movie. 小题2:  Chat with friends and family.

Take a Deep Breath  Breathing is a great way to reduce your stress. Taking deep breaths or doing breathing exercises may seem silly, but it do help you relax and clear up your mind.

Plan Ahead  Most students tend to study hard when test time comes close or do their homework right before it is due. However, having a plan will do a lot to decrease your stress.  小题3:   

Sleep  Sleep is another great tool in reducing stress. 小题4: You should be getting at least 6 to 8 hours of sleep each night. As you know, a lack of sleep can be bad for your health.

Learn to Say “No”   小题5: So there are times when it is okay to say “no” to the requests of friends, families and teachers. If it is going to add too much to your stress level, just say so.

A．There are a lot of ways to deal with stress.

B．Sometimes life gets pretty stressful.

C．Read an interesting book.

D．Some stress comes from doing everything you’re asked to do.E. It is essential that we allow our bodies to recover from daily stress.

F. Give yourself the appropriate amount of time to complete tasks, and break those tasks down into manageable portions.

G. You can lose yourself for a while in the music.

关于建筑内部排水管道水力计算正确的是( )。

A．建筑内部排水立管按其水流状态为水塞流进行计算

B．建筑内部排水横管按明渠非均匀流公式计算

C．建筑内部排水立管按其在不同通气情况下的最大通水能力进行设计

D．建筑内部排水横管水力计算公式中R是管道的半径

体育课程概念

儿童的从依赖性的情绪调节到独立的自我情绪调节的发展，是儿童心理健康成长过程的必由之路。