所有的燃料可以适用于任何发动机，油箱用管子连起来，这些管子都有单向阀门或者是飞行员控制的阀门。
All fuel can serve any engine, the tanks being linked by pipes with oneway or pilot-controlled valves.
它也用在一些大型的、低速的、单向做功的发动机上。
It is also used in some large, slow-speed, single-acting engines.
它也用在一些大型的、低速的、单向做功的发动机上。
It is also used in some large, slow-speed, single-acting engines.
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