单项选择题
（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.
A.Half length B.Mid-body C.Center line D.Amidships
单项选择题 A tide is called diurnal when（）.
单项选择题 Your vessel is docking, but not yet alongside. Which line will be the most useful when maneuvering the vessel alongside the pier?（）.
单项选择题 What is a CORRECT reply to a pilot’s request, How’s your heading?（）
