单项选择题
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
（）chart 3994，positions read from this chart should be s...
单项选择题（）chart 3994，positions read from this chart should be shifted 0.03 minutes Northward．
A.To consider B.To check C.To examine D.To agree with
