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“如今的计委（国家计划委员会）大院（位于北京城西三里河）已有几分落寞，冬天感觉更是如此，在灰色的天空和枯萎的树枝映衬下，苏式老楼越发显得破败，很多窗户已没了玻璃，用塑料编织袋勉强堵上。”（据北京晚报2013年3月2日）计委大院的落寞，是由于（）

A.中苏关系恶化
B．计划经济彻底退出舞台
C．中美关系正常化
D．市场经济体制逐步建立
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AVC系统中针对各类模型在建模中的考核类型分为哪几类（）
A.A类
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未知题型
Part II Reading Comprehension (25 minutes) Section A Directions: In this part there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. You may not use any of the words in the bank more than once. 注意：请在答题处填入相应的字母编号！字母一定要大写！ Anti-virus software 11 _______most of the viruses your users are likely to encounter - often without the user even knowing. However, the software must be 12_______ regularly, preferably daily in any large company. Even then, a very new virus can infect your users. With the rapid transmission of files through networks and the Internet, a virus can spread a 13_______ distance before it can be identified and protected against. Fortunately, only a few viruses ever do this but the likes of Melissa and the Love Bug can 14 _______serious damage before their progress is stopped. Whilst employees become suddenly aware during the ensuing media excitement, they soon forget about the virus threat as the stories disappear from the news headlines.　 　This is the danger. Complacency can set in when there is no 15_______ "action" on the virus front with no global crisis, and the importance of being 16_______ about viruses recedes in your users" minds. They forget what the big deal was in the first place - after all, the anti-virus software deals with the viruses, doesn"t it? And isn"t it the IT department"s job to look after this sort of thing? 　 　Before you know it your users are opening 17_______ attachments once more, downloading 18 _______software, and putting your company"s data and 19_______ at risk. All because the users think that they are working in a safe environment. Employees see anti-virus software, firewalls and IT departments as 20_______ that their computers will work and will be safe. Of course, there aren"t any guarantees. Anti-virus software plays one, albeit important, part in the defense of your company from malicious attack but the security of your computer system is only as strong as the weakest link. And that, more often than not, is the human factor. 　 A. pursuits B. updated C. unsupported D. download E. credibility F. detectsG. inflict H. perceived I. unsolicited J. guarantees K. authorizedL. considerable M. vigilant N. curseO. unauthorized 11. _______
单项选择题
数据质量码包含的类别有（）
A.不合理数据
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D．可疑数据
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