A.white light whose characteristic is Morse (A)
B.group-occulting white light
C.composite group-flashing (2 + 1) white light
D.composite group-flashing (2 + 1) red or green light
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A.lettered
B.spherical
C.showing a white light
D.All of the above
A.the equator
B.a great circle
C.a small circle
D.a meridian
A.the equator
B.a loxodromic curve
C.a small circle
D.a meridian
A.Great circle
B.Equator
C.Small circle
D.Meridian
A.great circle
B.loxodromic curve
C.small circle
D.gnomonic curve
最新試題
A preferred-channel buoy may be（）.
An orange and white buoy with a rectangle on it displays（）.
A nun buoy will（）.
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
A spherical buoy may be（）.
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）
A preferred-channel buoy will show a（）.
Buoys which mark isolated dangers are painted with alternating（）.
A yellow buoy may exhibit a(n)（）.
Fishing stake，the position of which frequently（），exist in the area covered by this chart.