单项选择题
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
The height of tide is the （）.A.depth of water at a spec...
单项选择题The height of tide is the （）.
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
The height of eye correction is smaller than geometrica...
单项选择题The height of eye correction is smaller than geometrical dip because of （）.
A. the angle between the horizontal and the line of sight to the visible horizon B. index error C. parallax D. terrestrial refraction
The height of a light is measured from which reference ...
单项选择题The height of a light is measured from which reference plane?（）
A.Mean low water B.Mean high water C.Average water level D.Geographical sea level
