A.the change in difference between the forward and aft drafts
B.the sum of free communication，free surface and pocketing
C.the moment of inertia of the ship's waterline plane about the athwartship axis
D.rolling and listing
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A.lower than the keel
B.at the same height as the center of gravity
C.exactly at midships
D.at the center of the waterplane area
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For a floating vessel，the center of flotation is the point in the waterplane（）.
A moment is obtained by multiplying a force by its（）.
The term length of a vessel in International Regulations for Preventing Collision at Sea 1972 means（）.
The ship should have a slightly deeper draft（）.
The center of buoyancy and the metacenter are in the line of action of the buoyant force（）.
What is NOT an advantage of the house-fall system when compared to a married-fall system using two of the ship’s booms? （）
Beams are cambered to（）.
Where must the draft marks be placed on a small passenger vessel? （）
In the absence of external forces，the center of gravity of a floating vessel is located directly above the（）.
The magnitude of a moment is the product of the force and（）.