____ are increasingly used as main engine on merchant vessels because they have a high Hp

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____ 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

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。