單項選擇題

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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單項選擇題

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

單項選擇題

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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When a buoy marks a channel bifurcation，the preferred channel is NOT indicated by（）.

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What is the major advantage of high altitude observations?（）

What is the light characteristic of a lighted，preferred-channel buoy? （）

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When a buoy marks a channel bifurcation，the preferred channel is NOT indicated by（）.

What is the light characteristic of a lighted，preferred-channel buoy? （）