A.concealed
B.buried
C.existed
D.built
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A.one nautical mile
B.two kilometers
C.5 cables only
D.one fathom
A.a vessel arrives at a port in a evening
B.a vessel leaves a port in a evening
C.a vessel arrives at a port in a morning
D.a vessel leaves a port in a morning
A.by
B.with
C.on
D.in
A.cable areas
B.dumping grounds
C.fish trap areas
D.precautionary areas
A.the period of darkness exceeds the period of light
B.there is only a partial eclipse of the light
C.the periods of light and darkness are equal
D.the period of light exceeds the period of darkness
最新試題
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
During a period of whiteout，you should expect which of the following（）.
Areas enclosed by a long and short dashed magenta line indicate （）.
The height of tide is the （）.
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 （）.
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.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）