Among the main propulsion units on board the ship with the same capacity, the lightest one is（）.<br>A:steam engine<br>B:steam turbine<br>C:gas turbine<br>D:diesel engine

Among the main propulsion units on board the ship with the same capacity, the lightest one is（）.
A:steam engine
B:steam turbine
C:gas turbine
D:diesel engine

出自：海船船员证

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