Home / Standards / GB/T 31226-2014 GB/T 31226-2014 Active Standard test method for determination of surface roughness by scanning tunneling microscopy for gas distribution system components 扫描隧道显微术测定气体配送系统部件表面粗糙度的方法 Standard Type GBT ICS 17.040.20 CCS J04 Status 现行 Issue Date 2014-09-30 Implementation 2015-04-15 Responsible Dept 中国科学院 Drafting Unit N/A