题目内容

下列关于数据压缩与解压缩的叙述，错误的是( )。

A. JPEG (Joint Photographic Experts Grou，适合于连续色调、多级灰度、彩色或单色静止图像的国际标准
B. MPEG (Moving Picture Experts Grou，包括MPEG视频、MPEG音频和MPEG系统三部分
C. P×64是CCITT的261号建议，P为可变参数，取值范围是1～30
D. P×64标准是用狭窄的频带实现高质量的图像画面和高保真的声音传送

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以下哪个URL的表示是错误的( )。

A. http://netlaabedcn
B. ftp://netlaabedcn
C. gopher://netlaabedcn
D. unix://netlaabedcn

案例分析题Mr. Faugel was convinced that student nervousness had affected their scores; to reduce the anxiety of these students who had already been tested, he gave 22 of them a beta blocker before readministration of the test. Their scores improved significantly. The other 8 students (who did not receive the beta blockers) improved only slightly. Second-time test-takers nationwide had average improvements which were similar to those in Faugel's non-beta blocker group. Beta blockers are prescription drugs which have been around for 25 years. These medications, which interfere with the effects of adrenalin, have been used for heart conditions and for minor stress such as stage fright. Now they are used for test anxiety. These drugs seem to help test-takers who have low scores because of test fright, but not those who do not know the material. Since there can be side effects from these beta blockers, physicians are not ready to prescribe them routinely for all test-takers. What possible use for beta blockers was NOT discussed in this passage（）

A. Test anxiety.
B. Z Pain relief.
C. Minor stress.
D. Heart conditions.

下面关于B-ISDN的叙述中，错误的是( )。

A. B-ISDN的中文名是宽带综合业务数字网
B-ISDN的核心技术是采用异步传输模式(AT
C. B-ISDN的带宽可以在155Mb／s以上
D. B-ISDN的协议分为3面和6层

二月革命后，为俄国无产阶级革命奠定思想基础的文献是( )。

A. 《四月提纲》和《国家与革命》
B. 《告工人、士兵和农民书》
C. 《国家与革命》和《和平法令》
D. 《和平法令》和《土地法令》