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