The （） engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.<br>A:four-stroke<br>B:two-stroke<br>C:slow speed<br>D:reversible

The （） engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.
A:four-stroke
B:two-stroke
C:slow speed
D:reversible

出自：海船船员证

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