虚拟存储管理系统的基础是程序的(28)理论,这个理论的基本含义是指程序执行时往往会不均匀地访问主存储器单元。根据这个理论,Denning提出了工作集理论。工作集是进程运行时被频繁地访问的页面集合。在进程运行时,如果它的工作集页面都在(29)内,能够使该进程有效地运行,否则会出现频繁的页面调入/调出现象。
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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(71), and that it has a mechanism for(72)graphical files. Display text, display graphics, and(73)hyperlinks--there's 99 percent of the(74)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(75)for application development? Remember frames and all their nasty side effects?
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(66)is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.(67)is a protocol that most USENET machines how use it to allow news articles to propagate from one machine to another over a reliable connection.(68)is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.(69)is a device used to connect two separate network that use different communication protocol.(70)js a digital
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