单项选择题
Which word indicates color variation in the characteristics of a light?（）
A.Opposing B.Changing C.Reversing D.Alternating
单项选择题 Which two components pass through the shank of an LWT anchor?（）
单项选择题 Which statement describes the shore between Watch Hill Point and Point Judith? （）
单项选择题 Which fitting is used to connect the boom to the mast? （）
