Home / Standards / GB/T 21111-2007 GB/T 21111-2007 Active Projection in indoor rooms - Classification of transmitting projection screens and measurement of their transmitted luminance levels 室内放映 透射放映银幕的分类和亮度测定 Standard Type GBT ICS 37.060.10 CCS N42 Status 现行 Issue Date 2007-10-11 Implementation 2007-12-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A