7931| 1
|
[国家标准] GB 7231-2003 工业管道的基本识别色、识别符号和安全标识 |
| ||
|关于我们|网站地图|油气储运网 ( 鲁ICP备11007657号-3 )
GMT+8, 2024-12-22 17:03 , Processed in 0.024398 second(s), 13 queries , Gzip On, MemCached On.
Powered by Discuz! X3.5
Copyright © 2001-2023, Tencent Cloud.