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單項選擇題

A chart position enclosed by a semi-circle is a(n) （）.

A.fix
B.estimated position
C.dead reckoning position
D.running fix

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單項選擇題

（）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

單項選擇題

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

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