A fully loaded motor-propelled lifeboat must be capable of attaining a speed of at least（）.<br>A:3 knots in smooth water<br>B:6 knots in smooth water<br>C:3 knots in rough water<br>D:6 knots in rough water

A fully loaded motor-propelled lifeboat must be capable of attaining a speed of at least（）.
A:3 knots in smooth water
B:6 knots in smooth water
C:3 knots in rough water
D:6 knots in rough water

出自：海船船员证

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