单项选择题
A.fix B.line of position C.relative bearing D.range
A chart position enclosed by a semi-circle is a(n) （）.A...
单项选择题A chart position enclosed by a semi-circle is a(n) （）.
A.fix B.estimated position C.dead reckoning position D.running fix
（）is a term denoting the determination of a ship’s posi...
单项选择题（）is a term denoting the determination of a ship’s position by observations of Celestial or terrestrial objects，or by a combination of both．
A.Course-planning B.Position-fixing C.Radar-plotting D.Stowage-plan making
The changes in the channel’s sands and buoys on this co...
单项选择题The changes in the channel’s sands and buoys on this coast are （） this chart can not be considered as a safe guide of the channel．
A.frequent B.so frequent C.frequent that D.so frequent that
