The invention is simple in structure, and convenient in mounting, dismounting and change.
本发明结构简单，安装方便，拆卸更换方便。
The small size, light weight, easily operation, safe use and simple dismounting to move.
体积小、重量轻，极易操作，使用安全，拆装移动简便。
The small size, light weight, easily operation, safe use and simple dismounting to move.
体积小、重量轻，极易操作，使用安全，拆装移动简便。
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