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batteryman银虫 (正式写手)
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【求助】救命啊 急需帮助解答及道题啊 拜谢啊
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Q1 There are some methods to draw a calibration curve. Please show us （at least) three methods and explain them in detail. ============================================================== Q2 Consider a municipal water treatment plant for a small community. Waste water, 32000 m3/day, flows through the treatment plant with a mean residence time of 8 hr, air is bubbled through the tanks, and microbes in the tank attack and break down the organic material microbes (Organic waste) + O2 →CO2 + H2O A typical entering feed has a BOD of 200mg O2 / liter, while the effluent has a negligible BOD. Find the rate of reaction. Elicitation process has to be shown. If you need, you can define and use characters as a constant or a variable by your self. HINT, the rate of reaction (r) of reaction is equal to “– ro2”, so find “– ro2” ============================================================== Q3 Please write a short essay based on one of the subjects described below. Within 400 words is preferable. 1.destruction of ozone layer 2.acid rain 3.biodiversity decrease 4.ocean pollution 5.transboundary movement of hazardous waste 6.destruction of forests 7.desertification |
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2楼2009-06-12 21:09:26
batteryman
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3楼2009-06-12 21:14:07
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