The reference datum used in determining the heights of land features on most charts is（）.<br>A:mean sea level<br>B:mean high water<br>C:mean low water<br>D:half-tide level

The reference datum used in determining the heights of land features on most charts is（）.
A:mean sea level
B:mean high water
C:mean low water
D:half-tide level

出自：海船船员证

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