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篇篇学之3:The Embankment DamsThere are three mainly types of dams: gravity dams,embankment dams and arch dams.(Considering these dams are ordinarily,we just take these for example.),Here we just describe the embankment dam.NO2.Embankment dams(We have described the gravity dam in the second chapter)
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只看楼主 我来说两句抢地板希望前辈师兄们帮帮忙指点一下!!!
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