單項(xiàng)選擇題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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題The center of flotation of a vessel is（）.

A.the center of volume of the immersed portion of the vessel
B.the center of gravity of the water plane
C.that point at which all the vertical downward forces of weight are considered to be concentrated
D.that point at which all the vertical upward forces of buoyancy are considered to be concentrated

4.單項(xiàng)選擇題The center of buoyancy is located at the（）.

A.geometric center of the waterplane area
B.intersection of the vertical centerline and line of action of the buoyant force
C.center of gravity of the vessel corrected for free surface effects
D.geometric center of the displaced volume

5.單項(xiàng)選擇題The average of the forward and after drafts is the（）.

A.mean draft
B.true mean draft
C.mean of the calculated drafts
D.draft at the center of flotation