下列（）光纤属于ITU-T的分类方法。

[单选题]颈动脉解剖描述错误的是（　　）。

[问答题]Questions 1 to 5 are based on the following passage.　　Computer users fed up with hacker attacks and other security threats that exploit holes in Microsoft software are increasingly turning to alternatives such as open source Internet browsers developed by Mozilla.　　“It’s reflective of a trend that we’ve seen over the last year with more web users becoming frustrated with the Internet experience,” said Chris Hoffmann of the Mozilla Foundation, a non-profit group supported by Sun Microsystems, IBM and other companies, backing as an alternative to Microsoft.　　Much of that frustration has centered on Microsoft, which has been heavily criticized for producing software vulnerable to hand virus writers. Microsoft has responded with a series of patches designed to plug vulnerabilities in its Windows operating system, Internet Explorer web browser and other software.　　But computer owners are growing weary of continuously updating software to protect against new threats. One incident last month enabled hackers to gain access to web surfers’ computers by taking advantage of vulnerabilities in Microsoft’s browser.　　Hackers could then install remote access Trojan programs that enabled them to control a victim’s computer. The hackers could also install software to capture a victim’s keystrokes to steal data such as bank account numbers and passwords.　　Mr. Hoffmann hoped publicity stemming from Microsoft’s security woes(灾难) would translate into a market share increase for Mozilla’s software, which includes the new highly regarded Firefox Internet browser.　　But Mozilla suffered a setback last week when it was forced to issue a software patch to counter a newly discovered vulnerability affecting its Internet browsers.　　Still, Mr. Hoffmann said Microsoft’s security woes stem in part from the way its browser has been integrated into Windows for user convenience. Security experts agree that has made it easier for hackers to exploit computers running on Microsoft software.　　Others suggest Microsoft has been targeted by hackers and virus writers simply because more than 90 per cent of the world’s computers run on the software giant’s operating system.　　Questions:　　1．What is the meaning of the phrase “fed up with” (Para.1)?　　2．It can be guessed that the word “plug” (Para.3) means ________________.　　3．Why more web users have become frustrated?　　4．What happened to Mozilla’s Internet browsers last week?　　5．How would Microsoft be less vulnerable?

[单选题]（）是瓜亮蓟马的主要天敌。

[单选题]咽-结合膜热的病原体为（　　）。

[判断题]被保险人不如实告知年龄，保险合同无效。

[多选题]关于素描的正确说法有：（）

[单选题]常说的“红眼”病临床治疗取（）。

[填空题]Adobe InDesignCS2中默认情况下，始终叠印应用了（）印刷黑色的对象，包括所有黑色描边、填色和任何大小的文本字符。

[多选题]下列对事业单位的属性表述正确的是（　　）。

[单选题]科技小组的同学们调查发现，北京地区存在几种不同类型的发电站，如图所示．下列发电站发电过程中，利用不可再生能源发电的是（　　）．

[单选题]下列（）光纤属于ITU-T的分类方法。

[单选题]下列（）光纤属于ITU-T的分类方法。

[问答题]ITU－T规范了哪几种单模光纤？各自有何特点？

[单选题]ITU-T表示什么（）。

[单选题]ITU-T定义的SDH段开销中，使用者通路字节是哪个？它符合ITU-T的哪个建议（）.

[单选题]（）是由ITU-T和ISO两个组织联合组建的联合视频组（JVT）共同制定的新数字视频编码标准，所以它既是ITU-T的H.264，又是ISO/IEC的MPEG-4...

[单选题]信元定界，ITU－T建议采用HEC方式，即将每（）比特进行CRC计算，若结果与其后的8比特相等，则认为找到了一个信头。

[单选题]信元定界，ITU-T建议采用HEC方式，即将每（）比特进行CRC计算，若结果与其后的8比特相等，则认为找到了一个信头。

[问答题]光纤芯线是由哪几部分构成的？光纤的分类是什么？

[问答题]光纤芯线是由哪几部分构成的？光纤的分类是什么？