15.依國際海上避碰規則，「SAFE SPEED」之條件為：
(A)Speed less than 3 knots.
(B)The speed can maintain a proper lookout for avoiding the collision.
(C)The ship’s speed can be stopped within 2 minutes.
(D) It depends on the circumstances and conditions

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統計： A(5), B(9), C(3), D(6), E(0) #1214641