【文章內(nèi)容簡介】 .. 180。237。206。243。163。161。206。180。182。168。210。229。202。233。199。169。161。163。 [184。249。190。221。202。181。188。202。196。218。200。221。204。238。208。180。] .......................................................... 180。237。206。243。163。161。206。180。182。168。210。229。202。233。199。169。161。163。 summary ............................................................................ 180。237。206。243。163。161。206。180。182。168。210。229。202。233。199。169。161。163。part 4 analysis/discussion ......................................................... 4 [184。249。190。221。202。181。188。202。196。218。200。221。204。238。208。180。] ............................................................................................ 5 [184。249。190。221。202。181。188。202。196。218。200。221。204。238。208。180。] ............................................................................................ 5 [184。249。190。221。202。181。188。202。196。218。200。221。204。238。208。180。] ............................................................................................ 5 summary .............................................................................................................. 5part 5 conclusion ........................................................................... 6references .......................................................................................... 7appendix ................................................................................................ 8part 1 introduction motivationfirst of all, we find we usually use a label to describe a country. for example,france is romantic。 america is free and open。 egypt is mystery. so some questions hitus. what is the impression of china on foreigners? is it true? is there any labels theyuse to describe chinese163。191。then, with the step of reform and revolution in china163。172。bothof the lives and education of chinese have been improved. but when we watch newson internet163。172。we find that there are still some prejudice about chinese. so we want toknow china in foreigners161。175。eyes. methods1.2.3.4. listing some questions. going out and interviewing some foreigners in the street. chatting on line with foreigners. organizing the information. significance1.2.3.4. difficultiessome districts, economy in minhang district is relatively backward and thepopulation is not very large, so we got up early on saturday to go to some bustlingdistricts longing to meet more foreigners. however, maybe the time we chose was notvery suit. we did not meet lots of foreigners in the morning. we just hung out in thestreet under the strong sun. fortunately, our interview became more smooth in theafternoon.what161。175。s more, many interviewees wouldn161。175。t like to take the video, so we may misssome details. on the other hand, it increases our difficulties in organizing theinformation after the interview.part 2background some views on china1, chinese people161。175。s feeling is different.their life.161。177。2, chinese people like reputation very much.161。176。i know if i don161。175。t prove myself in front of my students, i will have to listen to a161。176。lecture161。177。 about china161。175。s fivethousandyear history.161。177。, said by chris coley, teachinginternational relations in renmn university of china.3, chinese people are sensitive about some topics.161。176。the opinions of chinese people may not reconcile with those of western peopleon some topics. in fact, i really don161。175。t know what the ideas of chinese people on somesensible questions are, because chinese people always keep off them.161。177。, said bygerard van brecht, from the netherlands.4163。174。 china is a confusing but mysterious country. chinese people161。175。s personalities arealso uncertain.part 3 case studylast week, we did a research in midnorthern campus. the survey emphasized onbefore the interview, we guess it may be such: crowed street,uncultivatedchinese, chinese kung fu, confucius and so on. but later we find it isquite different from our imagination.during the research, we interviewed a few foreigners and asked them somethere anything about china that isn161。175。t true?161。177。, and161。176。what leads to thesedistinctions.161。177。after that, we heard about several interesting answers. according to thereply, we make a conclusion about the key words: food, people, environment andculture. foodeach foreigner refers to the chinese food. there is sharp distinction betweenreality and imagination. contrary to what they find in local china town, food in chinais generally healthy, delicious and beautifully presented, which is different from whatthey have heard about, such as unhealthy, fat and dirty. so why chinese food made inforeign country is so bad?why chinese food leave a bad impression in foreigners161。175。eyes? it isa question worth thinking about. peopledifferent. most of chinese care about face problem very much, which stands for someone plays joke on him, it might offend him. what161。175。s more, mike, aenglish teacher from german told me that, as chinese students are so hardworking,they know a lot but talk little. and they prefer to listening to teachers rather than198。170。200。253。163。186。211。162。206。196。202。181。209。233。177。168。184。230。196。163。176。229。determination of heavy metals in soil by atomic absorption spectrometry(aas)name: xufei group: the 3rd groupdate: sep. 20th 2012part 1 the introduction1. 1the purposes(1)learn how to operate the atomic absorption spectrometry。(2)learn how to do the pretreatment of soil samples。(3)get familiar with the application of atomic absorption spectrometry.1. 2the principlesatomic absorption spectrometry (aas) is a technique for measuring quantities of chemical elements present in environmental samples by measuring the absorbed radiation by the chemical element of interest. this is done by reading the spectra produced when the sample is excited by radiation. the atoms absorb ultraviolet or visible light and make transitions to higher energy levels .the concentration is calculated based on the beerlambert law. absorbance is directly proportional to the concentration of the analyte absorbed for the existing set of conditions. the concentration is usually determined from a calibration curve, obtained using standards of known concentration. calibration curve method: prepare standard solutions of at least three different concentrations, measure the absorbance of these standard solutions, and prepare a calibration curve from the values obtained. then measure the absorbance of the test solution adjusted in concentration to a measurable range, and determine the concentration of the element from the calibration curve.part 2 the materials and apparatuspart 3 the procedure operating procedure for aas(2) install required hollow cathode lamp. select 161。176。t161。177。 before turning to the power and hollow cathode lamp. then select appropriate la mp current and preheat for 30min.(3) make sure electrical meter to point to zero and then turn on highvoltage power.(4) select appropriate slit width.(5) rotate monochromator and select required wavelength. if the power meter is too high or low, adjust negative high voltage until the meter reads full scale.(6) adjust light point and wavelength so that the meter represents the maximum value.(8) inject distilled water into the flame and continue to preheat the burner. inject distilled water into the flame after each sample.(9) select 161。176。e161。177。, inject blank solution into the flame and adjust the meter to zero.(10) optimize analysis conditions and measure standard solution and samples.(12) select 161。176。t161。177。 before turning off high voltage power, decrease lamp current and then turn off the lamp. at the same time, all buttons should be on original positions.(13) check the equipment before leaving the laboratory. determination of soil samples(1) preparation of extracting solution ( mol/l edta solution) g of edta is