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1、一·Thediagramsbelowshowthestagesandequipmentusedinthecement-makingprocess,andhowcementisusedtoproduceconcreteforbuildingpurposes.·Summarisetheinformationbyselectingandreportingthemainfeatures,andmakecomparsonswherereleant.·Thefirstdiagramindicatesthestagesandequipmentintheprocessofmakingcement,an
2、dthesecondoneillustrateshowcementandothermaterialsaremixedtoproduceconcreteforbuildingpurposes.·Cementproductioninvolvesthefollowingsteps.Thefirststepistoputlimestoneandclayontwodifferentconveyors.Then,thesetwotypesofmaterialsarepressedintothecrusherwhichbreaksthemintopowder. Afterthat,thepowder
3、ispouredintoamixer,andthenmixturesaretransmittedintoarotatingheaterwhichworkswithheat.Thefollowingstepisthatabandcarrierleadstheheatedpowdertoagrinderwherethecementcomesout.Finally,cementispackedintobags,andtheprocessisfinished.·Concreteproductionismuchmoresimple.Fourdifferentkindsofmaterialsare
4、neededindifferentproportion.Gravelaccountsforthelargestpart,at50%,followedbysand,whichis25%.Cementandwatercontributes15%and10%respectively.Thefourmaterialsarethenmixedandpouredintoaconcretemixerandafteraperiodofwhirling,concreteisproduced.·Inconclusion,makingcementhasmorecomplexprocessthanmaking
5、concretethoughconcreteneedsmorematerialsthancement.二·Thediagramsbelowshowthelifecycleofthesilkwormandthestagesintheproductionofsilkcloth.·Summarisetheinformationbyselectingandreportingthemainfeatures,andmakecomparisonswhererelevant.·Thefirstdiagramshowsthattherearefourmainstagesinthelifeofthesil
6、kworm.Firstofall,eggsareproducedbythemothandittakestendaysforeacheggtobecomeasilkwormlarvathatfeedsonmulberryleaves.Thisstagelastsforuptosixweeksuntilthelarvaproducesacocoonofsilkthreadarounditself.Afteraperiodofaboutthreeweeks,theadultmothseventuallyemergefromthesecocoonsandthelifecyclebeginsag
7、ain.·Thecocoonsaretherawmaterialusedfortheproductionofsilkcloth.Onceselected,theyareboiledinwaterandthethreadscanbeseparatedintheunwindingstage.Eachthreadisbetween300and900metreslong,whichmeanstheycanbetwistedtogether,dyedan
