The interval of the average elapsed time from the meridian transit of the moon until the next high tide is called the（）.<br>A:harmonic constant<br>B:establishment of the port<br>C:half-tide level<br>D:tide cycle

The interval of the average elapsed time from the meridian transit of the moon until the next high tide is called the（）.
A:harmonic constant
B:establishment of the port
C:half-tide level
D:tide cycle

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