短语词组短语camber of beam 梁拱;梁弧高梁拱高;梁孤高camber -beam [建]弓背梁thin wall camber box beam 薄壁曲线箱梁connect camber beam 连接弯梁beam camber 梁弧高;梁拱;梁拱高;梁上拱度 返回 camber beam