中型货架： 承重量大，结构简单每层层板最大载重可达300kg，层高50mm任意调节,安装方便，不用螺栓拼装而成，装拆方便，且可无限连接!
               medium-sized shelf: load-bearing capacity, simple structure, the maximum load of each layer boards up to 300kg, 50mm storey any adjustment, easy installation, no bolt assembly made easy assembly and disassembly, and unlimited connections!