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單項選擇題

The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.

A.air gap
B.freeboard
C.penetration
D.water depth

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單項選擇題

The distance between the surface of the water and the tidal datum is the （）.

A.range of tide
B.height of tide
C.charted depth
D.actual water depth

單項選擇題

The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.

A.difference in longitude
B.mid-longitude
C.departure
D.meridian angle

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