Home / Standards / GB/T 1149.11-2010 GB/T 1149.11-2010 Abolished Internal combustion engines - Piston rings - Part 11: Half keystone rings made of cast iron 内燃机 活塞环 第11部分：楔形铸铁环 Standard Type GBT ICS 27.020 CCS J92 Status 废止 Issue Date 2010-11-10 Implementation 2011-03-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会