... silica-sand cement 石英砂水泥 silicasol 硅溶胶 silicastone 硅质沉积岩 ...
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The center pipe is machined from 64mm tubing, and the sand filter is made from silica sand, cement, additive.
滤砂器是根据不同技术标准筛选不同粒度的石英砂、油井水泥、添加剂和水按配比加工压制的。
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