试件的制备

• Plastics pipes and fittings preparation of test piece assemblies between a polyethylene pipe and an electrofusion fitting
  塑料管材和管件聚乙烯管材和电熔管件组合试件的制备
• Welding consumables . test methods . part 2 : preparation of test piece for single - run and two - run technique test specimens in steel
  焊接消耗材料.钢的单道和双道焊技术试样试件的制备