A.fixed red light
B.Morse (A) white light
C.composite group-flashing light
D.yellow light
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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
A.should be passed close aboard on either side
B.indicates that special caution is required
C.is used at a channel bifurcation or junction
D.is painted with red and white vertical stripes
A.easterly courses in high latitudes
B.southerly courses in high latitudes
C.westerly courses in low latitudes
D.easterly courses in low latitudes that cross the equator
最新試題
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
A SEAMARK，I.E. A BUOY，INDICATING THE NORTH，EAST，SOUTH OR WEST FROM A FIXED POINT，E.G. A WRECK is（）.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
A rock and sand structure extending from the bank of the river toward the channel is known as a（）.
A preferred-channel buoy will show a（）.
A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
A relative bearing is always measured from（）.
A white buoy with an orange rectangle on it displays（）.
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）