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英语四级考试阅读单项选择练习题英语四级考试阅读单项选择练习题 In thelast twohundred yearsthere havebeen greatchanges inthe methodof productionof goods.This isnow alsotrue of the buildingindustry;for mechanizationhas beenintroduced.System buildingcan saveboth timeand money.The principleof system building isthat thebuilding ismade froma setof standardunits.These areeither madeat thebuilding-site orat afactory.Some designers,in fact,are standardizingthe dimensionsof rooms.They aremade inmultiples ofa singlefixed length,usually tencentimeters.This iscalled amodular标准件的system,and itmeans thatmanufactures canproduce standardizedfittings ata lowercost.The mostimportant factabout systembuilding isits speed.A ten-storey flat,for example,can bepleted infour months. There areseveral newmethods ofsystembuilding.One isthe panelmethod.In thiscase,the constructionpany sometimeserects afactory onthe site.The wallsand floorsofthebuilding,c...。