单选题The average height of the surface of the sea for all stages of the tide over a 19 year period is called（）.Amean high waterBmean low waterChalf-tide levelDmean sea level
单选题
The average height of the surface of the sea for all stages of the tide over a 19 year period is called（）.
A
mean high water
B
mean low water
C
half-tide level
D
mean sea level
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