... open web steel joist 空腹钢铁托梁 Trussed Steel Joist 桁式钢质栏栅 ; 桁钢搁栅 open truss steel joist 铁桁楼板搁肝 ...
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... open web steel joist 空腹钢铁托梁 Trussed Steel Joist 桁式钢质栏栅 ; 桁钢搁栅 open truss steel joist 铁桁楼板搁肝 ...
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