There are many piping systems in the engine room, such as fuel oil system, cooling system, lubricating system, fire-fighting system. How do you identify them?
机舱中有许多管系，像燃油系统，冷却系统，滑油系统，消防系统，怎样识别它们？
2
There are many piping systems in the engine room such as fuel oil system, cooling system, lubricating system, fire system, fighting system. How do you identify them?