固体污染物:水中以固体形态存在的污染物,其存在态包括悬浮状态、胶体状态和溶解状态三种。 悬浮物:粒径在1nm以下,主要以低分子或离子状态存在的固体物质。 浊度:水中含有泥土、粉砂、微细有机物、无机物、浮游生物等悬浮物和胶体物都可以使水质变的浑浊而呈现一 定浊度,水质分析中规定:1L水中含有1mgSi所构成的浊度为一个标准浊度单位,简称1度

纳米给人的新希望 拥有一台只有手掌大小的超级电脑或许仍是个遥不可及的梦想,不过来自美国及荷 兰的最新研究结果,使人们朝这个目标迈出了重要的一步。 当你我可能还为着广告中那即薄又轻的笔记型电脑钦羡不己的时候,科学家早已把 目光放在纳米尺度的电子元件上。虽然早在1974年, aviram和 Ratner便提出了分子级 电子元件( molecular electronic device)的概念,直到最近几年,科学家才知道如何以碳纳 米管( carbon nanotube)、纳米线( nanowire)或有机分子建构导线、开关等单一电子元 件 而根据在几周前的 Science的一篇文章,荷兰 Delft University of Technology的ces Dekker所带领的研究小组已成功地利用碳纳米管制作了好几种数位逻辑运算电路

Unit 9 Section A Premarital agreements warm-up Questions Background Information 1. premarital agreements Premarital agreements or prenuptial agreements are binding legal contracts between two people who intend to marry each other

Teaching plan Book three Unit Five Section A Graceful hands. Warm-up Questions and Introductory Remarks （1)What does the title\ Graceful hands remind you of at first sight? （2)How did the woman die?

Band Three Unit I Section A The Expensive Fantasy of lord williams Warm-up questions What do you know about crime? What type of crime does the main character commit in section A? We encounter crime everywhere-on TV, in our neighborhoods, in our homes, with

Unit 3 Section A Where Principles Come First I. Warm up questions a. How the Hyde school succeeded in educating children?What causes that? b. How to improve high school education in a way to meet the damands of the society?

Unit six Section A How to Prepare for Earthquakes Warm-up questions 1. Have you ever been in an earthquake? 2. What do you think you would do first if the room started to shake? 3. How should we prepare for earthquakes?

Book two Unit nine Preview Students all over the world dream of what will happen in their future. Many hope to travel abroad where they can both use their education and earn a good salary. Large, modern countries like English and America welcome such graduates, making it easy for them to enter the count

Book two Unit si Section a: As his Name Is. so is hel Preview This writer describes ways names can make a difference. When one woman used her middle name, she felt better and her professional achievement improved. A magazine

UNIT THREE Word Study 1. character n (1)C](指个人、民族、社会特有的)天性,性格;特色:(事物的)特性 ---He has a strong but gentle character 他有坚强但温柔的性格