Water Supply(17.供水工程)

Themoreprosperousmanbecomes,themorewaterheuses.In1980sindevelopingcountries(theThirdWorld),somecommunitiesmanagewithanaverageof2.5gallons(12liters)ofwaterperpersonperday.InmostEuropeancitiesthedailydomesticconsumptionpercapitaofthepopulationisnearer33gallons(150liters).Inthemostprosperousurbanareasof ......(共5535字)[阅读本文]>>

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