短语词组短语beam -arch composite bridge 梁拱组合体系桥梁continuous beam -arch bridge 连续梁拱桥the used beam -bridge 在用梁桥rc simple supported beam -bridge 混凝土简支梁桥hybrid beam cable -stayed bridge 混合梁斜拉桥the used rc beam -bridge 在役rc梁桥 返回 beam bridge