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时间:2020-07-05
《高中英语 Module1 Life in the Future 第5课时学案 外研版必修4.doc》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Period5:CulturalCorner学习目标:1.了解人们对未来世界的种种预测2.树立跨文化交际意识3.掌握重点句子的用法学习重点:了解人们对未来世界的种种预测学习难点:掌握重点句子的用法课前预习使用说明与学法指导:1.树立跨文化交际意识2.15分钟之内完成教材助读:GlassRecyclingGlasshastheleastvolatilepricingofallthepostconsumerrecyclingcommodities.Composedofsandandpotash;bottleglassismadefromreadilyavaila
2、bleandinexpensiverawmaterials.Tobecompetitive,recycledglassmustmaintainapricethatcompeteswiththeseabundantrawmaterials.Tradedasflint(clear),amber(brown),emerald(green)ormixedcolorbrokenglass.Thepricedependsonthecleanlinessandcoloroftherecycledproduct.Cleanflintcullet(anotherwordfor
3、brokenglass)isusuallythemostdesirableformofrecycledglassscrap.Mixedcolorbrokenglasswithceramicsorstonesmixedinitistheleastdesirablegradeofculletbringingthelowestprice.MostRecyclerscolorsortandbreakorcrushandscreenbottlesbeforesellingtheirproduct.Modern,highproductionbottlemanufactu
4、ringrequiresverycleananduniformfeedstock.Overthepastdecadetherehasbeenagrowthintheglassbenefactionsector.Theseareintermediateprocessorsthatreceiveglassfromrecyclingprogramsandrunitthroughaseriesofstepstoremoveanycontaminants(rocks,ceramics,metalcaps,etc.)andprovideauniformfeedstock
5、tothebottlemanufacturers.Thesepreprocessorprovideanexcellentmarketforrecyclingprogramsthatdonothavethevolumeorabilitytoproduceglassfordirectmilldelivery.Glassbeneficiationplantsusesophisticatedopticalsortingmachinestoseparatetheglassintothethreecolortypes.Theymayalsox-raytheglassto
6、detectanyrocksorceramicswhicharethenremoved.Magnetsandeddycurrentseparatorsareusedtoremovedmagneticandnon-magneticmetalcontaminationfromcapsandlids.Theendproductisauniformlysizedloadofgroundglassthatisfreeofcontaminantsreadilyacceptablebybottlemanufacturers.Lowergradesofrecycledgla
7、ssthataretoomixedorcontaminated,maybeusedinconcreteorinroadpavingmaterialcalled"Glasshalt".Insomeareaswherethereisanoverabundanceoflowgradeglassitisusedtocoverovertherubbishinthelandfillinplaceofsand.Thisisnottrulyrecyclinganditishopedthatbettersortingtechnologywillsoonmakethismate
8、rialusablefornewbottles.Gl
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