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單項(xiàng)選擇題

Class I and II private aids to navigation in or along navigable waters of the United States are listed in the（）.

A.Sailing Directions
B.Light List
C.List of Private Aids
D.Aids to Navigation Manual

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單項(xiàng)選擇題

Chronometer error may be found by（）.

A.radio time signal
B.comparison with a timepiece of known error
C.applying the prevailing chronometer rate to previous readings
D.All of the above

單項(xiàng)選擇題

Charts showing the coast of Mexico are produced by the United States（）.

A.National Geospatial-Intelligence Agency
B.Coast Guard
C.Naval Observatory
D.National Ocean Service

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