A.assumed
B.appreciated
C.promised
D.permitted
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A.by
B.with
C.on
D.in
A.when at anchor
B.only when making way
C.at any time when underway
D.only when the identifying lights are not being shown
A.one nautical mile
B.two kilometers
C.5 cables only
D.one fathom
A.increases in north latitude and decreases in south latitude
B.decreases as DLO increases
C.increases with increased latitude
D.decreases with increased latitude
A.Mean low water
B.Mean high water
C.Average water level
D.Geographical sea level
A.the time of day
B.the seasons
C.geography
D.All of the above
A.Snowfall or blowing snow
B.Lack of ability to estimate distance
C.Harsh contrast between sun-illuminated snow cover and the background
D.Hazy horizons with extensive mirage effects
A.air gap
B.freeboard
C.penetration
D.water depth
A.List of Lights
B.Coast Pilot
C.Sailing Directions
D.List of Radiobeacons
A.concealed
B.buried
C.existed
D.built
最新試題
Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.
A vessel not to impede the passage of another vessel is not relieved （） taking collision-avoiding action.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.
Areas enclosed by a long and short dashed magenta line indicate （）.
The meaning of ebb tide is that （）.
At last，the palm trees that fringe the natural harbor of Port Aloahoa come into view on the horizon lit by the setting sun.The meaning of this sentence is that （）.
A pilot vessel on pilotage duty shall show identity lights （）.
Conditions for crossing a rough bar are usually best at （）.
AFTER DROPPING THE PILOT means （）.