In using reduction gears to obtain efficient propeller speeds, （）.<br>A:they must be located at the after end of the engine<br>B:they can only be used with one engine at a time<br>C:they eliminate the need for controllable pitch propellers<br>D:they are connected to the engine with a flexible coupling

In using reduction gears to obtain efficient propeller speeds, （）.
A:they must be located at the after end of the engine
B:they can only be used with one engine at a time
C:they eliminate the need for controllable pitch propellers
D:they are connected to the engine with a flexible coupling

出自：海船船员证

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