单选题A fully loaded motor-propelled lifeboat must be capable of attaining a speed of at least（）.A3 knots in smooth waterB6 knots in smooth waterC3 knots in rough waterD6 knots in rough water
单选题
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
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