A.flashing
B.pulsating
C.occulting
D.alternating
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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
A.plane tangent at one point
B.cylinder tangent at the equator
C.cone tangent at one parallel
D.infinite series of cones tangent at selected parallels
最新試題
A vessel is（）when she is not at anchor，made fast to the shore，or aground.
A rock and sand structure extending from the bank of the river toward the channel is known as a（）.
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）
Buoys which mark dredging areas are painted（）.
A yellow buoy may exhibit a(n)（）.
An orange and white buoy marking a danger area will have what symbol on it?（）
A white buoy with a blue band is（）.
Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE? （）
A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
Buoys which mark isolated dangers are painted with alternating（）.