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
Buoys which mark dredging areas are painted（）.
A relative bearing is always measured from（）.
Buoys which mark isolated dangers are painted with alternating（）.
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? （）
A yellow buoy may exhibit a(n)（）.
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is（）.
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
Branford reef is（）.