久久人搡人人玩人妻精品_亚洲欧洲av无码专区_无码免费观看视屏在线_在线观看高清无码a最新 蜜桃传媒婷婷亚洲AV,久久er99热精品一区

skills requirement:

●The surface is flat, the dimensional error is no more than 2mm, and there is no distortion.

●The weld seam is clear, no blisters, and no leakage after 3MPa water pressure test.

●The water in the water flows smoothly, and does not deform under the pressure of 3 MPa.

●Water mist, sizing, oil mist erosion.

●Material SUS304.