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1、Inthelasttwohundredyearstherehavebeengreatchangesinthemethodofproductionofgoods.Thisisnowalsotrueofthebuildingindustry;formechanizationhasbeenintroduced.Systembuildingcansavebothtimeandmoney.Theprincipleofsystembuildingisthatthebuildingismadefromasetofstandardunits.Theseareeithermadeatthebuildi
2、ng-siteoratafactory.Somedesigners,infact,arestandardizingthedimensionsofrooms.Theyaremadeinmultiplesofasinglefixedlength,usuallytencentimeters.Thisiscalledamodular(标准件的)system,anditmeansthatmanufacturescanproducestandardizedfittingsatalowercost.Themostimportantfactaboutsystembuildingisitsspeed.
3、Aten-storeyflat,forexample,canbecompletedinfourmonths. Thereareseveralnewmethodsofsystembuilding.Oneisthepanelmethod.Inthiscase,theconstructioncompanysometimeserectsafactoryonthesite.Thewallsandfloorsofthebuilding,calledpanels,arecastinahorizontalorverticalposition.Conduitsforelectricalwiresan
4、dsleevesforpipesarecastinthepanelswhentheyarebeingmade.Themouldsformakingthesecastingsaresituatedallaroundthebuilding. Aftertheconcretepanelsarecast,theyareallowedtosetandhardenforaweek.Nexttheyareliftedbyatowercraneontoanysectionofthebuilding.Therethepanelsarecementedtogetherattheirjointsandt
5、hefloorcoveringislaid. Afterthepanelshavebeencementedtogether,thecraneliftsacaseintothearea.Itcontainsallthefittingstobeinstalled,suchaswash-basins,radiatorsandpipes.Finishingtradesmen,suchasplumbers,plasterers,paintersandelectricians,followbehindtocompletethework. Insomebuildingdevelopments,
6、insomecountries,wholeflatswithinternalfeaturesliketheirbathrooms,bedroomsandconnectingstairs,andweighingasmuchastwentytons,arecarriedtothebuilding-siteready-made.Agiantoverheadcraneisusedtoliftthemintoposition.Inthefuture,thismethodmaybecomemorewidespread. 1.WhichofthesestatementsisTRUEofsyste
7、mbuilding? A.Itemploysmoremen. B.Itisdifficultanddangerous. C.Itcansavebothtimeandmoney. D.Itmeanslessmechanization. 2.Themaindifferencebetweenpanelmethodandthemethoddiscussedinthelastparagraphis_______. A.thelatterusesready
