单项选择题

The meaning of ebb tide is that （）.

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

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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

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

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