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问题 单项选择题

有时打印出的图形边缘会有一部分被打印机”吃掉”，实质性的原因是（）。

A、当前图层被关闭

B、当前图层被设为不打印

C、图形超出了当前视口边框之外

D、图形超出了当前页面的可打印区域

答案

参考答案：D

填空题

现用10mol•L-1的浓硫酸来配制500mL0.2mol•L-1的稀硫酸，可供选择的仪器有：①玻璃棒②烧杯③胶头滴管④量筒⑤容量瓶⑥托盘天平⑦药匙

（1）上述仪器在配制过程中不需要用到的是______．（填序号）

（2）配制该溶液应选用______　ml容量瓶

（3）计算所需浓硫酸的体积为______．现有①10mL②50mL③100mL三种规格的量筒，应当选用______．（填序号）

（4）实验中两次用到玻璃棒，其作用分别是：______、______．

（5）配制时，一般可分为以下几个步骤：

①计算②量取③稀释④______⑤转移⑥洗涤⑦定容⑧摇匀．

（5）配制好的溶液______填“能”或“不能”）长期存放在容量瓶中．
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单项选择题

Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to ___29___ Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".

In phishing, the perpetrator sends out legitimate-___30___ 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 ___31___ 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 ___32___ entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing ___33___

33（）

A. habits signature     

B. manageability

C. efficiency

D. address
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