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單項(xiàng)選擇題

Charted depths（）by 2 meters due to state of the winds．

A.is decreased
B.decreased
C.decreases
D.are decreased

單項(xiàng)選擇題

Charted depth is the（）.

A.vertical distance from the tidal datum to the ocean bottom plus the height of the tide
B.vertical distance from the tidal 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