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洗井
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洗井
Encyclopedia
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well washing
洗井
水井打成之后,需替换和清洗井内的泥浆、沉淀物,以及井壁泥皮和含水层孔隙内的堵塞物等,使砾料和靠近砾料含水层中的颗粒重新按其大小自然排列,以形成良好的人工过滤层,水流畅通并达到水清、砂净的作业。
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museum souvenir
Museums: Their History and Their Use
museum store
Museum Store Association
Museum Store Association Code of Ethics
Museum Studies,Faculty of Arts and Social Sciences,The University of Sydney
museum study
museum summer camp/winter camp
museum supervisory board
museum sustainability index
museum teacher training
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Museum Theatre
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Museum Visitor Services Manual
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museum volunteer management
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