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[单选题]

One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.

A . the extra weight required for the diesel reduction gearing

B . a minimum speed for the engines that limits the minimum speed of the vessel

C . the higher fuel consumption per SHP

D . the low efficiency of the system when a controllable pitch propeller is used

参考答案与解析：

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