按电场特性，电机分为静电场电选机、电晕电场电选机、和（）。A、复合电场电选机 B、室式

一列简谐横波在t₁=0时刻的波形图如图所示，已知该波沿x轴正方向传播，在t₂=0.7s末时，质点P刚好出现第二次波峰，试求：

（1）波速υ；

（2）x坐标为6m的Q点第一次出现波谷的时刻t₃=？

依据《燃煤二氧化硫排放污染防治技术政策》，逐步提高城市用电、燃气等清洁能源比例，清洁能源应优先供应（）。

A.电厂锅炉

B.大型窑炉

C.大型工业燃烧设施

D.城市民用炉灶

E.小型工业燃烧设施

在生产能力指数法的公式中，若已建类似项目的规模和拟建项目的规模相差不大，Y₁与Y₂的比值在( )之间，则指数n的取值近似为1。

A．0.5～2

B．0.5～3

C．0.5～4

D．0.5～1

1982年11月，邓 * * 在全国政协五届五次会议上指出：我们的统一战线比过去任何时期更加扩大了，是广泛的爱国统一战线，前程远大，大有可为。我们一定要坚持“（）”的方针，共同开创我国社会主义现代化建设的新局面。

A.长期共存，互相帮助，真诚相待，荣辱与共

B.长期共存，互相监督，肝胆相照，荣辱与共

C.长期合作，互助互利，肝胆相照，荣辱与共

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