单项选择题
（）length of the ship measured from extreme points of the ship forward and aft.
A.Length overall B.After perpendicular C.Amidships D.Extreme breadth
单项选择题 You should always wear（）when working on deck.
单项选择题 （）is the head of the Deck Department.
单项选择题 The man in charge of a ship is（）.He is responsible for the ship ,her cargo and the safety of the crew.
