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美国一家公司最近研制成功一种聚合物增强水泥,称为“无缺陷水泥”。它是用聚丙烯经特殊方法处理而成。其内部孔隙不大于1%
A U.S. company recently developed a polymer-reinforced cement called “defectless cement.” It is made of polypropylene processed by special methods. Its internal porosity is not more than 1%