單項(xiàng)選擇題

Which chart symbol indicates the bottom is clay（）.

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

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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

單項(xiàng)選擇題

The soundings on the imperial chart are measured in（）.

A.Feet
B.Yards
C.Fathoms
D.Meters