单项选择题

What describes an accurate position that is NOT based on any prior position? （）

A.Dead-reckoning position
B.Estimated position
C.Fix
D.Running fix

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单项选择题

Uncharted lights，fog signals and radar beacon transmissions may be（）near the station.

A.encountered
B.met
C.contacted
D.seen

单项选择题

Two navigational hazards are located near to each other，but each is marked by an individual cardinal buoyage system. The buoys of one cardinal system may be identified from the other system by（）.

A.the differing light colors
B.one system having odd numbers while the other system has even numbers
C.one system using horizontal bands while the other system uses vertical stripes
D.the difference in the periods of the light