roofbeam
美
英 
例句
Early Prestressing Force Producing the Prefabricate Roofbeam the Platform Design and Construct
預應力先張法生產預制梁臺座設計施工技術
The Quality Common Fault of the Joint of Roofbeam and Post in Armored Concrete Project and the Problem Method
鋼筋混凝土工程梁柱結點的質量通病及防治