A.small circle
B.great circle
C.rhumb line
D.hyperbola
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A.untrue
B.impossible
C.suspectful
D.unimportant
A.date of construction or establishment
B.length of time between flashes of the light
C.time required for the longest flash of each cycle
D.time required for the light to complete each cycle
A.under existing visibility conditions
B.under perfect visibility
C.with ten miles visibility
D.with fifteen miles visibility
A.nominal range
B.luminous range
C.charted range
D.geographic range
A.glare from background lighting
B.existing visibility conditions
C.elevation of the light
D.observer's height of eye
最新試題
The recording fathometer produces a graphic record of the（）.
When entering a channel from seaward，the numbers on buoys（）.
What is a lighted safe water mark fitted with to aid in its identification（）.
When navigating a vessel，you（）.
When entering from seaward，a buoy displaying a single-flashing red light would indicate （）.
（） is a circular traffic lane used at junctions of several routes，within which traffic moves counterclockwise around a separation point or zone.
The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the（）.
When a buoy marks a channel bifurcation，the preferred channel is NOT indicated by（）.
（） is a defined area within which ships must use particular caution and should follow the recommended direction of traffic flow.
The four standard light colors used for lighted aids to navigation are red，green，white，and （）.