单项选择题
What would be prima facie evidence of unseaworthiness? （）
A.Overloading B.Overstowage C.Overbooking D.Overcarriage
单项选择题 What is the purpose of pressure-vacuum relief valves? （）
单项选择题 What is the principle behind dynamic braking as used on an anchor windlass?（）
单项选择题 What is the holding power ratio of an anchor? （）
