兑水 发表于 2009-9-10 19:17:31

ASTM A 978-1997重力流动卫生用排污管道暴雨排污管道专用...

A978/A978M-97(2002)e1 Standard Specification for Composite Ribbed Steel Pipe, Precoated and Polyethylene Lined for Gravity Flow Sanitary Sewers, Storm Sewers, and Other Special Applications
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