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

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单项选择题

A.frequent
B.so frequent
C.frequent that
D.so frequent that

单项选择题

A.To consider
B.To check
C.To examine
D.To agree with

单项选择题

A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection