最 低 价：￥13.70
定 价：￥19.90
作 者：(英)Vanessa Jakeman，(英)Clare McDowell著 著
出 版 社：外语教学与研究出版社
出版时间：2002-04
I S B N：756002683
| 姓名：(英)杰克曼 (英)麦克道尔著 作者简介： 作品：《剑桥雅思考试全题型预测试题集-1-(含CD光盘2张)》 姓名：(英国)Vanessa Jakeman著 作者简介： 作品：《剑桥雅思考试全题型预测试题集-1-(含CD光盘2张)》 |
| 插图： the quest for a practical match really be-gan after 1781 when a group of frenchchemists came up with the phosphoric candleor ethereal match, a sealed glass tube con-taining a twist of paper tipped with phospho-rus. when the tube was broken, air rushedin, causing the phosphorus to self-combust.an even more hazardous device, popular inamerica, was the instantaneous light box——abottle filled with sulphuric acid into whichsplints treated with chemicals were dipped. the first matches resembling those_usedtoday were made in 1827 by john walker, anenglish pharmacist who borrowed the formulafrom a military rocket-maker called congreve.costing a shilling a box, congreves weresplints coated with sulphur and tipped withpotassium chlorate. to light them, the userdrew them quickly through folded glass paper. walker never patented his invention, andthree years later it was copied by a samueljones, who marketed his product as lucifers.about the same time, a french chemistry 更多 |
前言 introduction practice test1 practice test2 practice test3 practice test4 general training: reading and writing module tapescripts answer keys sample answer sheet |
内容加载中，请稍后...
商品评论（0条）