单项选择题
The path that a vessel is expected to follow，represented on a chart by a line drawn from the point of departure to the point of arrival，is the（）.
A.DR plot B.track line C.heading D.estimated course
单项选择题 The only cylindrical chart projection widely used for navigation is the （）.
单项选择题 The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
单项选择题 The maximum difference between mean time and apparent time is （）.
