GB国家标准 GB/T 22893-2008 纸和纸板基本尺寸办公用纸成包纸页卷曲的测定 GB/T 22893-2008.Paper and board-Cut-size office paper- Measurement of curl in a pack of sheets. 8.2按... 12月11日GB/T 22893 阅读全文