protective filter
... Propylite 青盘岩 Protective filter 保护滤层 Proving ring 衡圈、计力圈 ...
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鉴于反滤层是防止土石坝渗透破坏的有效措施，设置反滤层的依据是被保护料的性质和滤层准则。
In view of that filter is an effective measure to protect earth rockfill DAMS from seepage failure, the filter is provided on the basis of the property of protected material and the filter criteria.
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