单项选择题 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(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?(77)

单项选择题 地下连续墙的槽段结构接头不采用（）。

单项选择题 OMT是一种对象建模技术，它定义了三种模型，其中(49)模型描述系统中与时间和操作顺序有关的系统特征，表示瞬时的行为上的系统的“控制”特征，通常可用(50)来表示。(60)