One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.<br>A:the extra weight required for the diesel reduction gearing<br>B:a minimum speed for the engines that limits the minimum speed of the vessel<br>C:the higher fuel consumption per SHP<br>D:the low efficiency of the system when a controllable pitch propeller is used

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

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