如图是一列沿x正向传播的简谐横波在传播方向上相距3m的两质点P和Q的振动图象,其

题型:填空题

问题:

如图是一列沿x正向传播的简谐横波在传播方向上相距3m的两质点P和Q的振动图象,其实线是P点的振动图象,虚线是Q点的振动图象,若P质点离波源比Q质点近,则该波的最大波长为______

m,若Q质点离波源比P点近,则该波的最大波长是________m。

考点:波的图像
题型:填空题

Lin Dehua, boy, 13

School should make our lunchtime longer. Now, our lunchtime is short. Many of my classmates have some homework to do after lunch . But if they do not get a good rest, they won’t have enough energy for the afternoon. So I would like to have some time to take a nap (午睡)after lunch . That way we will learn well in the afternoon.

Zhang Huilin, girl,13

Food in our dining hall is not nice at all. There is always pork, fish, and cabbages. The soup is always cold. I think we should have different kinds of food every day. And why can’t we have hot soup every day ? I am fed up with what we eat !

Zheng Chuyu, boy,14

We want more time for sports activities. Students all need time for ball games. But there are only two hours for us to play ball games a week. I think school should be over before 4.30 p.m. every day and then we can go to the playground. I like badminton. All work and no play makes Jack a dull(迟钝的) boy !   

小题1:What do many of Lin Dehua’s classmates do after lunch ?

A.They get a good rest.

B.They get a nap.

C.They chat with each other.

D.They do their homework.小题2:Lin Dehua thinks       will help him learn well in the afternoon.

A.having a good lunch

B.having a nap

C.doing some exercise

D.having short lunchtime小题3:What is the meaning of ‘fed up with ’ in Chinese ?

A.喜欢

B.渴望

C.厌倦

D.欢迎小题4:How long does Zheng Chuyu exercise at school every day on average (平均)?

A.Less than half an hour.

B.Two hours.

C.More than half an hour.

D.Half an hour.小题5:Which is NOT true ?

A.Zheng Chuyu likes playing badminton.

B.Zheng Chuyu doesn’t want to be a dull boy.

C.Lin Dehua thinks lunchtime is too short now.

D.The students seldom have pork for lunch in the dining hall.

题型:填空题

这一天,该地的气温日较差是(  )

A.11.5℃

B.10.5℃

C.9℃

D.67.5℃

题型:填空题

下列哪些条目是SQL Server 2000中常用的对象Ⅰ.表Ⅱ.数据类型Ⅲ.约束Ⅳ.规则Ⅴ.视图Ⅵ.索引Ⅶ.默认值

A.仅Ⅰ、Ⅲ、Ⅴ和Ⅵ

B.仅Ⅰ、Ⅱ、Ⅳ和Ⅴ

C.仅Ⅰ、Ⅲ、Ⅴ、Ⅵ和Ⅶ

D.都是

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唇裂病人上唇的解剖形态是

A.上下唇宽度比例和谐

B.红唇中部稍厚且正中部呈珠状而向前下突出

C.上唇下1/3部微向上翘

D.鼻小柱及鼻尖居中,鼻孔对称等大

E.鼻小柱歪斜,鼻孔不对称

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植物细胞吸水有哪几种方式?

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