secondary cr/hr coils

secondary cr/hr coils HR and CR stainless steel coils 是什么 "Secondary steel GI,EG, CR, HR. HDG, PPGI, CRNGO, steel shee hr. 求管件类型英语翻译快Now, I am looking for carbon steel: HR CR GA GI EG CR Oscillate Wound Galvanized Steel Coils AYJackson Secondary secondary effect secondary effect是什么意思 HR是什么 HR supervisor ,HR department是什么意思 post-secondary-undergraduate是什么意思