发布时间:2025-01-31 11:57:23
呵呵,国标叫06Gr18Ni9(见GB4237-2007),零铬十八镍九。304不是简称,他是日标SUS304.
螺纹紧固件的规定标记一般gb47t后面带一些数字比如5780或者65是什么来的
2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23 2025-01-31 11:57:23为什么我种植的草坪一块一块的颜色不一样有的发黄有的墨绿有的颜色正常呢
2025-01-31 11:57:23