杆件变形的基本形式有（）。

A.流体是液体和气体的总称

B.流体是由大量的、不断地作热运动而且无固定平衡位置的分子构成的

C.流体都有一定的可压缩性，液体可压缩性大，而气体的可压缩性较小

D.在流体的形状改变时，流体各层之间存在一定粘滞性

E.当流体的粘滞性和可压缩性很小时，可近似看作是理想流体

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

A. direct B. navigateC. indicateD. go-on

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