Home / Standards / GB/T 40485-2021 GB/T 40485-2021 Active Method of determining automatically the random reflectance of vitrinite in coal—Image analysis method 煤的镜质体随机反射率自动测定 图像分析法 Standard Type GBT ICS 73.040 CCS D26 Status 现行 Issue Date 2021-08-20 Implementation 2022-03-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A