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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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
A.Group flashing
B.Composite group flashing
C.Interrupted quick flashing
D.Fixed and flashing
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
A.Dead-reckoning position
B.Estimated position
C.Fix
D.Running fix
A.encountered
B.met
C.contacted
D.seen
最新試題
What area of the earth cannot be shown on a standard Mercator chart（）.
A celestial body will cross the prime vertical circle when the latitude is numerically （）.
What describes a flood current（）.
When entering a channel from seaward，the numbers on buoys（）.
Which position includes the effects of wind and current（）.
You should plot your dead reckoning position（）.
Traffic separation schemes adopted by the IMO are listed in（）.
（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.
When approaching a preferred-channel buoy，the best channel is NOT indicated by the（）.
Restricted areas at locks and dams are indicated by（）.