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Most computer systems are (16) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (17) to an outsider attack by preventing.(18) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (19) users. Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment, but also helps to prevent future attacks. These attacks are usually (20) by tools referred to as Intrusion Detection Systems. （17）是（）
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A Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (26) , and that it has a mechanism for (27) graphical files. Display text, display graphics, and (28) hyperlinks-there’s 99 percent of the (29) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (30) for application development Remember frames and all their nasty side effects （27）处是（）
简答题 准确定义下列经济学概念：（1）固定成本。（2）可变成本。（3）总成本。（4）平均成本。（5）边际成本。
A Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (26) , and that it has a mechanism for (27) graphical files. Display text, display graphics, and (28) hyperlinks-there’s 99 percent of the (29) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred (30) for application development Remember frames and all their nasty side effects （26）处是（）
DOM is a platform and language- (51) API that allows programs and scripts to dynamically access and update the content, structure and style of WWW documents (currently, definitions for HTML and XML documents are part of the specification). The document can be further processed and the results of that processing can be incorporated back into the presented (52) . DOM is a (53) -based API to documents, which requires the whole document to be represented in (54) while processing it. A simpler alternative to DOM is the event-based SAX, which can be used to process very large (55) documents that do not fit info the memory available for processing. （52）是（）
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