The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is （）.<br>A:they operate between 150 and 450 rpm<br>B:they are connected to the propeller by gearing<br>C:their smaller size and weight<br>D:they can be connected directly to the propeller without gearing

The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is （）.
A:they operate between 150 and 450 rpm
B:they are connected to the propeller by gearing
C:their smaller size and weight
D:they can be connected directly to the propeller without gearing

出自：海船船员证

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