One fastening is an attaching fastening, wherein, two U-shaped dovetail groove tenons in reverse directions are arranged on a U-shaped block.
三是挂接连接件，是在U形块上有方向相反的两个U形燕尾槽榫。
A stop block is arranged at the base Angle of one side wall of every single-body U-shaped steel mould, and gaps between the stop blocks and the single-body U-shaped steel moulds are equidistant.
每一个单体U型钢模一侧壁底角处，均设有限位块，每个限位块与每一个单体U型钢模一侧壁的间隙均等距。
A stop block is arranged at the base Angle of one side wall of every single-body U-shaped steel mould, and gaps between the stop blocks and the single-body U-shaped steel moulds are equidistant.
每一个单体U型钢模一侧壁底角处，均设有限位块，每个限位块与每一个单体U型钢模一侧壁的间隙均等距。
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