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（）.
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 white buoy with an orange 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 structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
Branford reef is（）.
A special purpose buoy shall be（）.
Buoys which mark dredging areas are painted（）.
A relative bearing is always measured from（）.
Buoys which mark isolated dangers are painted with alternating（）.