ygs67 发表于 2016-1-24 16:21:22

ASTM C1504-15e1

ASTM C1504-15e1 Standard Specification for Manufacture of Precast Reinforced Concrete Three- Sided Structures for Culverts and Storm Drains

admin 发表于 2016-1-25 09:33:26

谢谢您的分享,金币已奖励!
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