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單項(xiàng)選擇題

Which information does the outer ring of a compass rose on a nautical chart provide（）.

A.variation
B.true directions
C.magnetic directions
D.annual rate of variation change

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單項(xiàng)選擇題

Which chart symbol indicates the bottom is clay（）.

A.Cly
B.Cla
C.Cl
D.C

單項(xiàng)選擇題

Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.

A.In the Coast Pilot
B.In the Nautical Almanac
C.In the List of Lights
D.In the Sailing Directions

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