为了在32KB/s的通信信道上开通可视电话,假设图像分辨率为160×120,256级

题型:填空题

问题:

为了在32KB/s的通信信道上开通可视电话,假设图像分辨率为160×120,256级灰度,每秒5帧,声音信息占16KB/s,则必须把图像数据量至少压缩______倍。

考点:计算机等级考试PC技术三级PC技术笔试
题型:填空题

电子商务系统的应用会遇到商家和客户的身份是否合法,订单生效后被抵赖等问题。因此,除了要有可靠的技术支持外还要有严格的法律保障。所谓数字签名即是技术手段之一。目前我国关于数字签名有效性的()

A.法律还在加紧研究和制定中

B.法律已经制定并生效

C.处理暂时还只能参照相关法律

D.处理还是依靠道德规范的约束

题型:填空题

阅读理解。

     "If there is one thing I'm sure about it is that in a hundred years from now we will still be reading

newspapers. It is not that newspapers are a necessity. Even now some people get most of their news

from television or radio. Many buy a paper only on Saturday or Sunday. But for most people reading

a newspaper has become a habit passed down from generation to generation.

     The nature of what is news may change. What basically makes news is what affects our lives-the

big political stories, the coverage of the wars, earthquakes and other disasters, will continue much the

same. I think there will be more coverage of scientific research, though. It's already happening in areas

that may directly affect our lives, like genetic (基因) engineering. In the future, I think there will be

more coverage of scientific explanations of why we feel as we do-as we develop a better understanding

of how the brain operates and what our feelings really are.

     It's quite possible that in the next century newspapers will be transmitted (传送) electronically from

Fleet Street and printed out in our own home. In fact, I'm pretty sure that how it will happen in the future.

You will probably be able to choose from a menu, making up your own newspaper by picking out the

things you want to read- sports and international news, etc.

     I think people have got it wrong when they talk about competition between the different media (媒体).

They actually feed off each other. Some people once foresaw that television would kill off newspapers,

but that hasn't happened. What is read on the printed page lasts longer than pictures on a screen or sound

lost in the air. And as for the Internet, it's never really pleasant to read something just on a screen.

1. What is the best title for the passage?

A. The Best Way to Get News

B. The Changes of Media

C. Make Your Own Newspaper

D. The Future of Newspaper

2. In the writer's opinion , in the future _____.

A. more big political affairs, wars and disasters will make news

B. newspapers will not be printed in publishing houses any longer

C. newspapers will cover more scientific research

D. more and more people will watch TV

3. What will probably be on in the newspaper made by yourself?

A. Sports and international news.

B. A menu of important news.

C. The most important news.

D. What you are interested in.

4. From the passage, we can infer _____.

A. newspapers will win the competition among the different media

B. newspapers will stay with us together with other media

C. television will take the place of newspaper

D. the writer believe some media will die out

题型:填空题

下述导致体温降低的因素中,哪项易导致心律失常()

A.寒冷环境中碘酊.酒精消毒胸前皮肤

B.术野及体腔长时间暴露在寒冷环境

C.快速输入4℃库血

D.冷液体冲洗四肢外伤创面

E.用寒冷的气体通气

题型:填空题

男,26岁,5天来鼻及牙龈出血,皮肽瘀斑。血红蛋白55g/L,白细胞10.0×109/L,血小板16×109/L。骨髓增生极度活跃,绝大多数细胞呈清一色,过氧化酶染色阴性,糖原染色阳性。

应首选的治疗是()

A.DA方案

B.全反式维A酸

C.羟基脲

D.VP方案

E.骨髓移植

题型:填空题

现实疗法的创始人是()

A.弗洛伊德

B.哥尼

C.葛拉瑟

D.艾丽丝

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