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The height of a light is measured from which reference plane?
A.Mean low water
B.Mean high water
C.Average water level
D.Geographical sea level
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单选题What best describes the structure from which Stratford Point Light is shown?（）A
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单选题The height of a light is measured from which reference plane?（）A
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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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单选题Charted depth is the（）.A
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