单项选择题

The difference between the initial trim and the trim after loading is known as（）.

A.trim
B.change of trim
C.final trim
D.change of draft

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单项选择题

The controlling depth of the river is（）.

A.the minimum depth of the river prescribed in the channel maintenance program
B.the edge of a dredged channel
C.the highest level to which the river may rise without flooding
D.the least available water in a channel which limits the draft of boats and tows

单项选择题

The center of volume of the immersed portion of the hull is called the（）.

A.center of buoyancy
B.center of flotation
C.center of gravity
D.tipping center

单项选择题

The center of the underwater volume of a floating vessel is the（）.

A.center of buoyancy
B.center of flotation
C.uncorrected height of the center of gravity of the vessel
D.center of gravity of the vessel corrected for free surface effects