Home / Standards / GB/T 1149.7-2010 GB/T 1149.7-2010 Active Internal combustion engines - Piston rings - Part 7: Rectangular rings made of cast iron 内燃机 活塞环 第7部分：矩形铸铁环 Standard Type GBT ICS 27.020 CCS J92 Status 现行 Issue Date 2010-11-10 Implementation 2011-03-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A