DIN ISO 1204:1994
往复式内燃机.旋转方向和气缸标识、气缸头阀门、直列式发动机右侧和左测定义及在发动机上的位置
Reciprocating internal combustion engines - 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