roofbeam
美
英 
例句
Early Prestressing Force Producing the Prefabricate Roofbeam the Platform Design and Construct
预应力先张法生产预制梁台座设计施工技术
The Quality Common Fault of the Joint of Roofbeam and Post in Armored Concrete Project and the Problem Method
钢筋混凝土工程梁柱结点的质量通病及防治