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
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The Earth has the shape of a(n) （）.
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
The period at high or low tide during which there is no change in the height of the water is called the （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
An occulting light is one in which （）.
During daylight savings time the meridian used for determining the time is located farther （）.
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 tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.