水平地面上有一个半径为R的圆形跑道，高为h的平台边缘上P点在地面上P′点的正上方，P′与跑道圆心O的距离为L（L＞R），P′AOC各点均在同一水平直线上，如图所示．已知重力加速度为g，空气阻力不计，小车可视为质点．则：

（1）若小车停在跑道上C点时，现从P点水平抛出小沙袋，使其落入小车中，沙袋被抛出时的初速度应为多大？

（2）若小车停在跑道上B点时（∠AOB=90°），现从P点水平抛出小沙袋，使其落入小车中，沙袋被抛出时的初速度为多大？

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

A. Web browser’s B. terminal’sC. emulator’s D. network’s

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