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

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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