單項選擇題In the absence of external forces，the center of buoyancy of an inclined vessel is vertically aligned directly below the（）.

A.center of gravity
B.amidships station
C.center of flotation
D.geometric center of the waterplane area


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1.單項選擇題In practice，it is usual for the ship to be loaded（）to improve the vessel’s movement through the water.

A.a little deeper aft
B.a little deeper forward
C.at the same draught between fore and aft
D.a balance between two sides

2.單項選擇題If the cause of severe list or trim is off-center ballast，counterflooding into empty tanks will（）.

A.increase the righting moment
B.increase the righting arm
C.increase list or trim
D.decrease list or trim

3.單項選擇題If the buoyant force on a ship’s hull is equal to the displacement tonnage，the ship will（）.

A.require ballast
B.be down by the head
C.sink
D.float

4.單項選擇題For an upright vessel，draft is the vertical distance between the keel and the（）.

A.waterline
B.freeboard deck
C.plimsoll mark
D.amidships section

5.單項選擇題For a floating vessel，true mean draft is always the（）.

A.average of the observed drafts
B.draft at the center of flotation
C.draft corresponding to the calculated displacement
D.mean of the calculated drafts