Home / Standards / GB 7228-1987 GB 7228-1987 Abolished Measuring and calculating method on efficiency of rectifiers and their consumers energy-conversion efficiency in electro-chemical industry 电解整流设备的整流效率及其供电对象的电能利用率测算方法 Standard Type GB ICS 29.200 CCS K01 Status 废止 Issue Date 1987-02-03 Implementation 1987-11-01 Responsible Dept 国家标准委 Drafting Unit N/A