标准查询 标准查询建筑用锥形、高强度低合金或低碳钢管的标准规范
Standard Specification for Steel Tubes, Low-Carbon or High-Strength Low-Alloy, Tapered for Structural Use
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标准查询Standard Specification for Steel Tubes, Low-Carbon or High-Strength Low-Alloy, Tapered for Structural Use
