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
Buoys which mark isolated dangers are painted with alternating（）.
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（）.
From your position you observe a rotating white and green light to the north. This light is most likely（）.
An orange and white buoy marking a danger area will have what symbol on it?（）
A white buoy with an open-faced orange diamond on it indicates（）.
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）
Fishing stake，the position of which frequently（），exist in the area covered by this chart.
Buoys which mark dredging areas are painted（）.
A special purpose buoy shall be（）.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）