单选题Charted depth is the （）.Avertical distance from the chart sounding datum to the ocean bottom，plus the height of tideBvertical distance from the chart sounding datum to the ocean bottomCaverage height of water over a specified period of timeDaverage height of all low waters at a place
单选题
Charted depth is the （）.
A
vertical distance from the chart sounding datum to the ocean bottom，plus the height of tide
B
vertical distance from the chart sounding datum to the ocean bottom
C
average height of water over a specified period of time
D
average height of all low waters at a place
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