The KM for a vessel may be determined by which of the following?（）.

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

单项选择题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
C.fore and aft perpendicular
D.height of the center of buoyancy

单项选择题The difference between the forward and aft drafts is（）.

A.list
B.heel
C.trim
D.flotation

单项选择题The center of flotation of a vessel is the point in the waterplane（）.

A.about which the vessel lists and trims
B.which coincides with the center of buoyancy
C.which，in the absence of external forces，is always vertically aligned with the center of gravity
D.which is shown in the hydrostatic tables as VCB