A tide is called diurnal when（）.<br>A:only one high and one low water occur during a lunar day<br>B:the high tide is higher and the low tide is lower than usual<br>C:the high tide and low tide are exactly six hours apart<br>D:two high tides occur during a lunar day

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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