亚洲丁香五月激情综合_亚洲中文字幕无码乱线_9久久伊人久久大香线蕉一区_五月天久久综合一区 国产一在线精品一区在线观看,亚洲日本中文字幕一区二区三区,日本精品第一色网在线,亚洲中文视频

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.