A.relative bearing
B.range line
C.track line
D.estimated position
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A.painted color
B.light color and phase characteristic
C.type of structure
D.All of the above
A.fixed red light
B.Morse (A) white light
C.composite group-flashing light
D.yellow light
A.flashing
B.pulsating
C.occulting
D.alternating
A.switching
B.alternating
C.oscillating
D.fluctuating
A.sharp turn in the channel
B.narrowing in the channel at that point
C.junction in the channel
D.obstruction that must be left to port
最新試題
A yellow buoy may mark a(n)（）.
Buoys which mark isolated dangers are painted with alternating（）.
A relative bearing is always measured from（）.
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）
Fishing stake，the position of which frequently（），exist in the area covered by this chart.
A white buoy with a blue band is（）.
Buoys which mark dredging areas are painted（）.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）