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單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

（）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

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