Home / Standards / GB/T 28520-2012 GB/T 28520-2012 Active Intelligent heat exchanger for telecommunication stations/sites 通信局站用智能热交换系统 Standard Type GBT ICS 29.220.99 CCS M42 Status 现行 Issue Date 2012-06-29 Implementation 2012-10-01 Responsible Dept 工业和信息化部(通信) Drafting Unit 工业和信息化部(通信)