A current moving across a lock entrance toward the river or toward the dam is called a(n)（）.

A common occurrence when a vessel is running into shallow water is that（）.

A.the wake is less pronounced
B.the vessel is more responsive to the rudder
C.squat will cause a decrease in bottom clearance and an increase in draft
D.All of the above

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（）is the vertical distance measured on the vessel’s side amidships from the load water line to the upper side of the freeboard deck or a point corresponding to it.

A.Buoyancy
B.Freeboard
C.Draft
D.Displacement

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