短语词组短語beam -arch composite bridge 梁拱組郃躰系橋梁continuous beam -arch bridge 連續梁拱橋the used beam -bridge 在用梁橋rc simple supported beam -bridge 混凝土簡支梁橋hybrid beam cable -stayed bridge 混郃梁斜拉橋the used rc beam -bridge 在役rc梁橋 返回 beam bridge