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Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to (71)Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".

 In phishing, the perpetrator sends out legitimate-(72)e-mails, appearing to come from some of the Web's most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be(73)because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim. In one form. of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected(74)entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing( 75 ).

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某公司有5个分公司依次设置在同一条铁路线的沿线A、B、C、D、E站。现在该公司希望在该铁路沿线设立一个仓库，要求该仓库离这5个站的火车行驶距离之和最小。如用数轴表示该铁路线，A、B、C、D、E各站的坐标依次为a、b、c、d、e(a＜b＜c＜d＜e)，则经过数学计算，该仓库大致应设置在坐标(70)处。

设每天发生某种事件的p很小，如不改变这种情况，长此下去，这种事件几乎可以肯定是会发生的。对上述说法，适当的数字描述是：设0＜p＜1，则(69)。

有8套计算机应用软件A、B、C、D、W、X、Y、Z要进行系统集成安装。虽然每套应用软件占用的存储空间不大，但部分应用软件调用操作系统底层相同的动态链接库(DLL)，出于安全考虑，某些应用软件不能安装在同一台服务器上。在图6-12中，符号“X”表示相应的两套计算机应用软件不能安装在同一台服务器上。那么这8套应用软件至少需要安装在(66)台服务器上，实现这种最少服务器台数的系统集成方案(不计各软件安装顺序)可有(67)个。

某公司需要根据下一年度宏观经济的增长趋势预测决定投资策略。宏观经济增长趋势有不景气、不变和景气3种，投资策略有积极、稳健和保守3种，各种状态的收益如表6-3所示。基于maxmin悲观准则的最佳决策是(68)。

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