题目：
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
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
