1. 槽钢：U-slot piston U形槽活塞 | U-steel 槽钢 | U-turn (车辆)调头
2. 振动：U-shaped manet 容器 | U-steel 振动 | V-belt 粘度
3. 形钢,槽钢：U形螺栓 U-shaped bolt | U形钢,槽钢 U-steel | U形带 U-strap