单选题A tide is called diurnal when（）.Aonly one high and one low water occur during a lunar dayBthe high tide is higher and the low tide is lower than usualCthe high tide and low tide are exactly six hours apartDtwo high tides occur during a lunar day
单选题
A tide is called diurnal when（）.
A
only one high and one low water occur during a lunar day
B
the high tide is higher and the low tide is lower than usual
C
the high tide and low tide are exactly six hours apart
D
two high tides occur during a lunar day
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