同义词
1)chemical oxygen demand (COD),化学需氧量 COD2)chemical oxygen demand,化学需氧量（COD）3)COD,COD（化学需氧量）4)chemical oxygen demand(COD),化学需氧量（COD）5)chemical oxygen demand,化学需氧量（COD_（Cr））6)COD,化学需氧量（COD）7)Chemical oxygen demand (COD),化学需氧量（COD）8)Chemical oxygen demand COD,化学需氧量COD9)chemical oxygen demanded,化学需氧量(COD)10)chemical oxygen demand(COD) removal,化学需氧量（COD）去除
