发动机（Engine）是一种能够把其它形式的能转化为机械能的机器，包括如内燃机（往复活塞式发动机）、外燃机（斯特林发动机、蒸汽机等）、喷气发动机、电动机等。如内燃机通常是把化学能转化为机械能。发动机既适用于动力发生装置，也可指包括动力装置的整个机器（如：汽油发动机...
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