GB国家标准 GB/T 7973-2003 纸、纸板和纸浆漫反射因数的测定(漫射/垂直法) GB/T 7973-2003.Paper , board and pulps-Measurement of diffuse reflectance factor(Diff/ Geometry). 1范... 01月02日GB/T 7973 阅读全文