single U groove 单面U形坡口
single-U groove 单U形坡口 ; 单U形槽
double-U groove 双U形槽
U groove weld 单面U型坡口焊缝
double U groove weld 双U形槽熔接
double-U groove weld 双U形槽焊接 ; 双面U型坡口焊缝
u-groove U型槽
Structural main beam: steel plate cold bending U type groove plus middle vertical rib plate combination.
结构 主梁：钢板冷弯U型槽加中幅立筋板组合。
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。
The groove adopts a closed and butted U-shaped groove (1) to be embedded in the ground surface around a trunk of the fruit tree so as to protect closely.
本发明采用一种封闭对接 的U型槽（1）埋设在果树树干周围的地表，对树干进行封闭保护。
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