A.gnomonic curve
B.small circle
C.meridian
D.great circle
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A.relative bearing
B.range line
C.track line
D.estimated position
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
最新試題
A spherical buoy may be（）.
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
Buoys which mark dredging areas are painted（）.
A vessel is（）when she is not at anchor，made fast to the shore，or aground.
A yellow buoy may exhibit a(n)（）.
A white buoy with an orange rectangle on it displays（）.
Branford reef is（）.
An orange and white buoy marking a danger area will have what symbol on it?（）
A preferred-channel buoy may be（）.
A nun buoy will（）.