The average height of the surface of the sea for all stages of the tide over a 19 year period is called（）.<br>A:mean high water<br>B:mean low water<br>C:half-tide level<br>D:mean sea level

The average height of the surface of the sea for all stages of the tide over a 19 year period is called（）.
A:mean high water
B:mean low water
C:half-tide level
D:mean sea level

出自：海船船员证

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