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 preferred-channel buoy may be（）.
An orange and white buoy with a rectangle on it displays（）.
Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic? （）
A nun buoy will（）.
A white buoy with a blue band is（）.
An orange and white buoy marking a danger area will have what symbol on it?（）
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 white buoy with an orange rectangle on it displays（）.
A rock and sand structure extending from the bank of the river toward the channel is known as a（）.
Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE? （）