Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to （1） Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".

In phishing, the perpetrator sends out legitimate-（2） 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 （3） 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 （4）entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing （5）

5（）

A.habits signature 

B.manageability 

C.efficiency 

D.address

某锅炉房占地面积为20m×10m，高度6m，房顶坡度为14°，属重点保护建筑问：

所选探测器的最大保护面积和最大保护半径：（）。

A.20、3.6

B.30、4.4

C.60、5.8

D.80、6.7