in excess on 怎么理解? if the pipe or tube thickness is over 7 mm, the specimen thickness shall be reduced to 5 mm by machining material in excess on the opposite side from that (those) in contact with the process fluid. 如果管道的壁厚超过7 mm,应加工试件不接触工艺流体的表面的多余材料,将其厚度加工到5mm。查看更多