筑成拱形以便將水壓的大部分傳遞到其拱基的一種混凝土壩或砌石壩。Aconcreteand/ormasonrydamwhichiscurvedsoastotransmitthemajorpartofthewaterpressuretotheabutments. (共 128 字) [閱讀本文] >>
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 筑成拱形以便將水壓的大部分傳遞到其拱基的一種混凝土壩或砌石壩。Aconcreteand/ormasonrydamwhichiscurvedsoastotransmitthemajorpartofthewaterpressuretotheabutments. (共 128 字) [閱讀本文] >>