单项选择题
What is the light characteristic of a lighted，preferred-channel buoy? （）
A.Group flashing
B.Composite group flashing
C.Interrupted quick flashing
D.Fixed and flashing
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相关考题
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单项选择题
What indicates a dual purpose buoy? （）
A.Red buoy with a horizontal yellow band
B.Red and white vertically-striped buoy with a vertical yellow stripe
C.Red and white vertically-striped buoy with a red spherical topmark
D.Green buoy with a yellow square -
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 -
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
