单项选择题
A position obtained by applying only your vessel’s course and speed to a known position is a （）.
A.dead-reckoning position B.fix C.probable position D.running fix
单项选择题 A line of position is（）.
单项选择题 A line connecting all possible positions of your vessel at any given time is a（）.
单项选择题 A large navigational buoy (LNB) is painted（）.
