单项选择题
The existence of liquids in partially full tanks or compartments of a ship causes a virtual rise in the height of the（）.
A.metacenter
B.center of buoyancy
C.center of flotation
D.center of gravity
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The downflooding angle for a ship is the minimum angle at which（）.
A.the load line becomes submerged
B.a non-watertight opening is at still water level
C.offset becomes excessive
D.reserve buoyancy is a maximum -
单项选择题
The difference between the height of the metacenter and the height of the center of gravity is known as the（）.
A.metacentric height
B.height of the righting arm
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单项选择题
The difference between the forward and aft drafts is（）.
A.list
B.heel
C.trim
D.flotation
