单项选择题
Based on a DR，at approximately 1817 you would expect to（）.
A.enter a traffic separation zone B.cross a submerged pipeline C.depart a regulated area D.depart a restricted area
单项选择题 At the master gyrocompass，the compass card is attached to the（）.
单项选择题 At sea，we can use（）to fix the ship’s position.
单项选择题 Assumption shall（）on the basis of scanty information especially scanty radar information.
