單項選擇題

A.return the vesselto an even keel
B.reduces free surface effect
C.lowers the center of gravity
D.raises the center of buoyancy

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A.stowed near open flame or where smoking is permitted
B.used as seats, pillows, or foot rests
C.left on open decks
D.All of the above

A.ballast
B.reserve buoyancy
C.displacement
D.rolling periods