（）are increasingly used as main engine on merchant vessels, because they have a high Hp/Weight ratio.<br>A:Slow speed diesel engines<br>B:Medium-speed diesel engines<br>C:Steam engines<br>D:Gasoline engines

（）are increasingly used as main engine on merchant vessels, because they have a high Hp/Weight ratio.
A:Slow speed diesel engines
B:Medium-speed diesel engines
C:Steam engines
D:Gasoline engines

出自：海船船员证

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