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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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单选题A vessel is tide rode when it is（）.A
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考题
单选题The period at high or low tide during which there is no change in the height of the water is called the （）.A
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考题
单选题潮汐周日不等（diurnal inequality of tide）的现象为（）。A
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相邻两次高潮或两次低潮潮高不等C
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考题
单选题有时风大流急，船舶靠码头时必须掉头顶流。（）A
A ship has to turn to stem the tide because the wind is strong when she is getting alongside a wharf.B
Sometimes the wind is strong and the current is rough, so a ship has to turn to stem the tide when she is getting alongside a wharf.C
The wind is big, a ship must get alongside a wharf so she has to turn to stem the tide.D
A ship has to turn to stem the tide so she can get alongside a wharf.
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