单选题The interval of the average elapsed time from the meridian transit of the moon until the next high tide is called the（）.Aharmonic constantBestablishment of the portChalf-tide levelDtide cycle
单选题
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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