Specification for designation of the direction of rotation and of cylinders and valves in cylinder heads, and definition of right-hand and left-hand in-line engines and locations on an engine for reciprocating internal combustion engines
气缸旋转方向和气缸盖中气缸和阀门的命名规范 以及往复式内燃机用右侧和左侧直列发动机和发动机上位置的定义