weld bolt造句

• Shipbuilding . locking handles for round flat hatch covers . welded bolt with packing
  造船工业.平甲板舱盖用闭锁柄.带压紧垫片的焊接销
• Steel nuts and bolts for resistance projection welding - specification for welding of weld nuts and weld bolts
  电阻凸焊的钢螺母和螺栓.焊接螺母和螺栓的焊接规范