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?
机舱中有许多管件，像燃油系列，冷却系列，滑油系列，消防系列，怎样识别它们？
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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?