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发表于 2009-12-4 14:40:24
ASTM F 1962-2005 安装聚乙烯管或在障碍物,包括河流交汇处下...
F1962-99 Standard Guide for Use of Maxi-Horizontal Directional Drilling for Placement of Polyethylene Pipe or Conduit Under Obstacles, Including River Crossings