题目内容

What is the application of high-speed diesel engines at sea?( )①They are used for emergency power generation to small applications; ②They are used forelectrical power generation on board ships driven by medium-speed propulsion engines;③They can be used on tugs,ferries and barges, etc. as main engines.

A. ①②.
B. ②③.
C. ③.
D. ①②③.

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