rigid arch
... 刚性支架：nonyielding prop 刚性拱顶：rigid arch 刚性拱：rigid arch ...
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该设备配以柔性轨道、刚性直轨道，分别焊接了储罐的弧形拱顶和立缝，取得了满意的效果。
This machine combining respectively with flexible trackway and rigid straight trackway is used to weld the dome and vertical wall of a storage tank, and the result is satisfactory.
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