前维护支架：拼接屏前维护支架采用高硬度金属铝型材，具有上下、左右、前后伸缩调节功能，伸缩主要由液压推杆和精密轴承
连接而成，整个框架硬度高、不变形比生锈纯厚度110毫米以上，展开尺寸能达到400mm以上，还能弧形拼接；方便了安装、
布线、维护大大的省时省力，外观大气
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