2021GB/T 6809.12-2021 Reciprocating internal combustion engines—Vocabulary of components and systems—Part 12: Exhaust emission control systems
2013GB/T 6809.2-2013 Reciprocating internal combustion engines.Vocabulary of components and systems.Part 2:Valves,camshaft drives and actuating mechanisms
2006GB/T 6809.2-2006 Reciprocating internal combustion engines.Vocabulary of components and systems.Part 2:Valves,camshaft drive and actuating mechanisms
1988GB/T 6809.2-1988 Reciprocating internal combustion engines--Vocabulary of components and systems--Valves, camshaft drive and actuating mechanisms