概念模型是将现实世界的客观对象抽象为某一种信息结构,它并不依赖于计算机系统,它的基本

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问题:

概念模型是将现实世界的客观对象抽象为某一种信息结构,它并不依赖于计算机系统,它的基本语义单位是______。

A.位与字节

B.数据与信息

C.实体与联系

D.概念与模型

考点:计算机等级考试信息管理技术三级信息管理技术笔试71
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儿童能以命题形式思维,则其认知发展已达到()。

A.感知运动阶段

B.前运算阶段

C.具体运算阶段

D.形式运算阶段

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如图,取一个瓶口内径略小于乒乓球直径的雪碧瓶,去掉其底部,把一只乒乓球放到瓶口处,然后向瓶里注水,会发现水从瓶口流出,乒乓球不上浮。若用手指堵住瓶口,不久就可观察到乒乓球上浮起来。此实验说明了

[ ]

A、大气存在压强        

B、连通器原理

C、浮力产生的原因    

D、液体的压强与液体的密度和深度有关

题型:单项选择题

Hi, I’m Xin Yue. I am 15 years old. I study at Monte Vista Christian School in California, US. The school ife in America is 小题1:  from that in China. I’d like to   小题2:  you something about my school life in America.

I took many textbooks to school in China. But in America, I usually take one thing    小题3:  me--- an iPad.

Every student at my school uses an iPad for study. We rent them from the school,  小题4:   costs about $ 100. We can use them for three years.

 小题5:  we have classes, we download textbooks and other teaching materials online with our iPads. We can not only read the electronic books,    小题6:  also listen to music or watch videos in class. It makes our study full of fun.

But they also bring us some    小题7: . Some of my classmates play games or do other things in class.

I think if we have good self-control, iPads can be very helpful. Do you   小题8:    with me?

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结合诸条约内容简述中国社会沦为半殖民地半封建社会的过程。

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班主任应怎样组织和培养班集体

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