<正>Henan Haiger Refractories Co.,Ltd., founded in 1992, has 70000 m2 of a land area, 6 production plants and a subsidiary company and produces 60000 tons high
<正>YB/T 4195-2009 1 ScopeThis standard specifies the term and definition,classification,technical requirements,test methods,quality appraisal procedures,packin