搜题

【单选题】

Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）

A、To reduce the main engine speed

B、To increase the main engine speed

C、To govern the main engine speed

D、To fix the propeller shaft

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第6题

[单选题] The （） engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.

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第7题

[单选题] The （） engine is used for alternators and some times for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.

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第8题

[单选题] 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.

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