最全雅思流程图汇总.doc

最全雅思流程图汇总.doc

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时间:2020-03-20

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1、一·Thediagramsbelowshowthestagesandequipmentusedinthecement-makingprocess,andhowcementisusedtoproduceconcreteforbuildingpurposes.·Summarisetheinformationbyselectingandreportingthemainfeatures,andmakecomparsonswherereleant.·Thefirstdiagramindicatesthestagesandeq

2、uipmentintheprocessofmakingcement,andthesecondoneillustrateshowcementandothermaterialsaremixedtoproduceconcreteforbuildingpurposes.·Cementproductioninvolvesthefollowingsteps.Thefirststepistoputlimestoneandclayontwodifferentconveyors.Then,thesetwotypesofmateria

3、lsarepressedintothecrusherwhichbreaksthemintopowder. Afterthat,thepowderispouredintoamixer,andthenmixturesaretransmittedintoarotatingheaterwhichworkswithheat.Thefollowingstepisthatabandcarrierleadstheheatedpowdertoagrinderwherethecementcomesout.Finally,cementi

4、spackedintobags,andtheprocessisfinished.·Concreteproductionismuchmoresimple.Fourdifferentkindsofmaterialsareneededindifferentproportion.Gravelaccountsforthelargestpart,at50%,followedbysand,whichis25%.Cementandwatercontributes15%and10%respectively.Thefourmateri

5、alsarethenmixedandpouredintoaconcretemixerandafteraperiodofwhirling,concreteisproduced.·Inconclusion,makingcementhasmorecomplexprocessthanmakingconcretethoughconcreteneedsmorematerialsthancement.二·Thediagramsbelowshowthelifecycleofthesilkwormandthestagesinthep

6、roductionofsilkcloth.·Summarisetheinformationbyselectingandreportingthemainfeatures,andmakecomparisonswhererelevant.·Thefirstdiagramshowsthattherearefourmainstagesinthelifeofthesilkworm.Firstofall,eggsareproducedbythemothandittakestendaysforeacheggtobecomeasil

7、kwormlarvathatfeedsonmulberryleaves.Thisstagelastsforuptosixweeksuntilthelarvaproducesacocoonofsilkthreadarounditself.Afteraperiodofaboutthreeweeks,theadultmothseventuallyemergefromthesecocoonsandthelifecyclebeginsagain.·Thecocoonsaretherawmaterialusedforthepr

8、oductionofsilkcloth.Onceselected,theyareboiledinwaterandthethreadscanbeseparatedintheunwindingstage.Eachthreadisbetween300and900metreslong,whichmeanstheycanbetwistedtogether,dyedan

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