單項選擇題When entering from seaward，a buoy displaying a single-flashing red light would indicate （）.

A.a junction with the preferred channel to the left
B.a sharp turn in the channel to the right
C.the starboard side of the channel
D.a wreck to be left on the vessel's port side


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1.單項選擇題When entering a channel from seaward，the numbers on buoys（）.

A.are the same as their Light List number
B.are marked in 6 inch figures with retroreflective material
C.increase with the even numbers to starboard
D.decrease with the odd numbers to starboard

2.單項選擇題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

3.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

4.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

5.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