Home / Standards / GBT 7974-2013 GBT 7974-2013 Paper, board and pulps — Determination of blue diffuse reflectance factor D65 brightness 纸、纸板和纸浆 蓝光漫反射因数D65亮度的测定 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A