讨论了排水管材的隔音原理；
公司前身为城北铸造厂，生产销售铸铁类给水、排水管材管件及铸铁件。
The company formerly known as North foundry, production and sales of cast iron-type water supply, drainage pipe fittings and cast iron pieces.
公司引进具有国际领先水平的给、排水管材管件及电工套管生产、检测设备和技术。
The company has introduced international advanced level of the drainage pipe casing pipe fittings and electrical production, testing equipment and technology.
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