单选题The datum from which the predicted heights of tides are reckoned in the tide tables is（）.Amean low waterBthe same as that used for the charts of the localityCthe highest possible levelDgiven in table three of the tide tables
单选题
The datum from which the predicted heights of tides are reckoned in the tide tables is（）.
A
mean low water
B
the same as that used for the charts of the locality
C
the highest possible level
D
given in table three of the tide tables
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