air preparation造句

• Water drainage , waste water treatment , outdoors water supply drainage , and the fire protection water system . - gas utility team : specialized in design of cold water , bulk gas h2 , o2 , n2 preparation , purified gas supply , compressed air preparation , and special gas co2 , ar2 , hcl . etc preparation system , etc
  气体动力设计组：冷冻水供给大宗气体制备提纯供给系统，空气压缩制备供给工程，特种气体r cl等制备提纯供给工程等。