A.range of the tide
B.plane of the tide
C.stand of the tide
D.reversing of the tide
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A.tide is falling from high water to low water
B.tide is rising from low water to high water
C.tide is reaching to a highest level
D.tide is reaching to a lowest level
A.depth of water at a specific time due to tidal effect
B.difference between the depth of the water and the area's tidal datum
C.difference between the depth of the water and the high water tidal level
D.difference between the depth of the water at high tide and the depth of the water at low tide
A. the angle between the horizontal and the line of sight to the visible horizon
B. index error
C. parallax
D. terrestrial refraction
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
最新試題
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 （）.
The height of tide is the （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
Clearance gauges at bridges indicate （）.
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 （）.
AFTER DROPPING THE PILOT means （）.
A pilot vessel on pilotage duty shall show identity lights （）.
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.
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．