单项选择题
When a buoy marks a channel bifurcation，the preferred channel is NOT indicated by（）.
A.the shape of an unlighted buoy
B.the light color of a lighted buoy
C.the color of the topmost band
D.whether the number is odd or even
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相关考题
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单项选择题
What is the major advantage of high altitude observations?（）
A.Errors due to unusual parallax are eliminated
B.The same body can be used for a fix from observations separated by several minutes
C.The declination is the only information needed from the almanac
D.The semidiameter correction of the sextant altitude is eliminated -
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 -
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
