A.painted color
B.light color and phase characteristic
C.type of structure
D.All of the above
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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
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
最新試題
Except for N-S courses，and E-W courses on the equator，a great circle track between two points，when compared to a rhumb line track between the same two points，will（）.
How would you pass a red buoy in the maritime buoyage system “A”? （）
A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
A preferred-channel buoy will show a（）.
An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol? （）
A mid-channel buoy，if lighted，will show a（）.
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.
Fishing stake，the position of which frequently（），exist in the area covered by this chart.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）