Standard specification for series 10 poly vinyl chloride closed profile gravity pipe and fittings based on controlled inside diameter 基于控制内径的系列10聚氯乙烯封闭外形重力管及设备的标准规范
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Project 62 - 02 - 03 specification for series 10 poly vinyl chloride closed profile gravity pipe and fittings based on controlled inside diameter project 62 - 02 - 03 基于可控内径的10号系列的聚氯乙烯封闭式异型重力管和管配件规范