【正文】 186。 181。179。db163。 202。172。r163。d163。206。191。214。177。194。163。:198。192。188。191。211。188。182。167。239。191。204。177。249。175。217。189。181。191。206。161。180。186。177。161。161。161。161。161。161。161。161。161。163。163。204。..4a. differences between literal translation and free translation .......41. 163。161。161。161。161。161。161。161。161。161。161。161。161。161。180。186。177。161。161。161。161。205。197。195。188。211。161。163。204。1 163。.161。161。161。161。161。161。161。161。161。ii abstract (in chinese)...161。161。161。161。161。..i abstract (in english)161。161。161。161。161。163。210。163。180。times new roman208。210。180。200。163。213。191。213。191。211。211。180。211。213。211。186。210。1163。163。203。163。210。209。163。203。188。210。210。.................... ..................................................................................................................................................................................................................................................................................................................................................................................................... 163。161。161。161。213。188。163。194。191。188。196。200。208。207。161。195。210。243。202。172。208。191。211。211。180。163。186。169。168。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。173。196。211。172。202。169。170。169。169。161。211。254。196。233。177。211。g/ml of cu, respectively. the absorbance is measured at wavelengths of 3247 ?. the standard curve is constructed by plotting absorbance vs. concentration.(5) determination of samplesthe sample solution is analyzed using the same procedure and conditions as for the standard curve. the concentration of cu is obtained from the standard curve based on the absorbance.part 4 the results the raw data aas standard curve calculationthe absorbance of sample is .according to the formula above :y=+,r2=the concentration of cu in the sample is:part 5 discussionin this experiment, we use the aas to determine cu in soil. i learn how to operate the aas and the limitation. in the experimental process, standard solution was prepared in strict accordance with the experimental requirements and i learn how to deal with the data. finally we get the standard curve, then, the sample concentration is calculated according to the absorbance of the sample.ultimately, we get the linear formula is y = + and r2=. from according to the formula and the absorbance of cu in the sample is , we draw the concentration of cu in the sample is 166。g/ml,166。 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 dissolved with water in a beaker (500 ml). the ph is adjusted to using dilute ammonia. the mixture is transferred into a volumetric flask (1000ml), dilute to the mark and mixed well.(2) treatment of soil samples g of airdried soil (60 100 mesh) is put into an erlenmeyer flask with stopper (100 ml). ml of edta solution is added. the mixture is shaken for 1h and then filtered. the filtrate is preserved for analysis.(3) preparation of cu standard stock solution g of cu is dissolved in 15 ml of (1:1) nitric acid solution. the mixture is transferred into a volumetric flask (1000 ml) and diluted to the mark with redistilled water. the concentration of the stock standard solution is 100g/ml. (the concentration should be calculated according to the mass of cu).the working cu standard solution (10166。 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。209。163。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。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。the opinions of chinese people may not reconcile with those of western peopleon some topics. in fact, i really don161。lecture161。s feeling is different.their life.161。we find that there are still some prejudice about chinese. so we want toknow china in foreigners161。] ............................................................................................ 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。196。] ............................................................................................ 5 [184。196。] ............................................................................................ 5 [184。196。part 4 analysis/discussion ......................................................... 4 [184。210。206。202。163。204。202。199。206。208。188。161。182。] .......................................................... 180。196。 [184。210。206。202。163。199。206。161。182。. important movements .................................................... 180。210。206。[2014196。210。195。196。211。204。163。181。178。212。179。170。191。238。194。175。227。247。246。163。243。172。246。172。187。191。172。181。208。gt。172。195。186。200。209。184。170。246。246。193。196。253。166。239。188。199。221。196。180。189。209。182。163。188。163。190。s voltage versus the time. after obtaining plots for each mass, we used thevoltageposition relationship, mentioned above, to convert the data from the form voltage versus time to the form position versus time residuals of the data determined whether the assumption of constant acceleration was valid.results202。example:t = mr (ga),where a is the acceleration of the mass. if the assumption holds that the only friction affecting the potentiometer was constant coulomb friction, then each mass would undergo a constant acceleration.the potentiometer measured voltage versus time for the masses as they dropped, but the measurement of interest to us was position versus time. for that reason, a 161。195。195。200。231。246。204。243。172。235。170。189。246。231。198。176。172。23