av免费不卡在线观看网址,黄色视频大全ww,h在线观看网站,亚洲视频在线免费观看,男人天堂视频在线播放,日本女同羞羞视频,jk美女隐私视频网站

　　Entrusted by Hebei Provincial Market Supervision Administration, in July 2019, Product Quality Supervision and Inspection Institute appointed the National Product Quality Supervision and Inspection Center for Steel (Tangshan) to conduct a spot check on high-carbon chromium bearing steel in our company. 24 different samples from the same batch are directly extracted from assembly line. As a result, all 32 items in 8 major items up to the standard of GB/T18254-2016, which shows the quality of our bearing steel products is excellent and reliable.