The four-stroke engine is used for （） and sometimes for main propulsion with a gearbox to provide a propeller speed of between 90 to 120 rev/min.<br>A:alternator<br>B:turbo-charger<br>C:remote controller<br>D:windlass

The four-stroke engine is used for （） and sometimes for main propulsion with a gearbox to provide a propeller speed of between 90 to 120 rev/min.
A:alternator
B:turbo-charger
C:remote controller
D:windlass

出自：海船船员证

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