单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

Deballasting a double bottom has what affect on KG?（）

A.KG is increased
B.KG is decreased
C.KG is not affected
D.KG increases at light drafts and decreases at deep drafts