单项选择题
Traffic separation schemes adopted by the IMO are listed in（）.
A.NM B.Ship's Routing C.Colreg D.Solas
单项选择题 The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.
单项选择题 The recording fathometer produces a graphic record of the（）.
单项选择题 The points on the earth’s surface where the magnetic dip is 90° are（）.
