单项选择题

When approaching a preferred-channel buoy，the best channel is NOT indicated by the（）.

A.light characteristic
B.color of the uppermost band
C.shape of an unlighted buoy
D.color of the light

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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

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