A tide is called diurnal when（）.
- Aonly one high and one low water occur during a lunar day
- Bthe high tide is higher and the low tide is lower than usual
- Cthe high tide and low tide are exactly six hours apart
- Dtwo high tides occur during a lunar day
问题
A tide is called diurnal when（）.
参考解析：
分类：狭水道、冰区与运河航行题库
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