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
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Fishing stake，the position of which frequently（），exist in the area covered by this chart.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
A relative bearing is always measured from（）.
An orange and white buoy with a rectangle on it displays（）.
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（）.
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
Buoys which mark dredging areas are painted（）.
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.