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1、5A版优质实用文档一·Thediagramsbelowshowthestagesandequipmentusedinthecement-makingprocess,andhowcementisusedtoproduceconcreteforbuildingpurposes.·Summarisetheinformationbyselectingandreportingthemainfeatures,andmakecomparsonswherereleant.·Thefirstdiagramindicatesthestagesandequipmentintheprocessofmakingceme
2、nt,andthesecondoneillustrateshowcementandothermaterialsaremixedtoproduceconcreteforbuildingpurposes.·Cementproductioninvolvesthefollowingsteps.Thefirststepistoputlimestoneandclayontwodifferentconveyors.Then,thesetwotypesofmaterialsarepressedintothecrusherwhichbreaksthemintopowder.Afterthat,thepowder
3、ispouredintoamixer,andthenmixturesaretransmittedintoarotatingheaterwhichworkswithheat.Thefollowingstepisthatabandcarrierleadstheheatedpowdertoagrinderwherethecementcomesout.Finally,cementispackedintobags,andtheprocessisfinished.·Concreteproductionismuchmoresimple.Fourdifferentkindsofmaterialsareneed
4、edindifferentproportion.Gravelaccountsforthelargestpart,at50%,followedbysand,whichis25%.Cementandwatercontributes15%and10%respectively.Thefourmaterialsarethenmixedandpouredintoaconcretemixerandafteraperiodofwhirling,concreteisproduced.·Inconclusion,makingcementhasmorecomplexprocessthanmakingconcrete
5、thoughconcreteneedsmorematerialsthancement.5A版优质实用文档5A版优质实用文档二·Thediagramsbelowshowthelifecycleofthesilkwormandthestagesintheproductionofsilkcloth.·Summarisetheinformationbyselectingandreportingthemainfeatures,andmakecomparisonswhererelevant.·Thefirstdiagramshowsthattherearefourmainstagesinthelifeof
6、thesilkworm.Firstofall,eggsareproducedbythemothandittakestendaysforeacheggtobecomeasilkwormlarvathatfeedsonmulberryleaves.Thisstagelastsforuptosixweeksuntilthelarvaproducesacocoonofsilkthreadarounditself.Afteraperiodofaboutthreeweeks,theadultmothseventuallyemergefromthesecocoonsandthelifecyclebegins
7、again.·Thecocoonsaretherawmaterialusedfortheproductionofsilkcloth.Onceselected,theyareboiledinwaterandthethreadscanbeseparatedintheunwindingstage.Eachthreadisbetween300and900metreslong,whichmeanstheyc
