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

A.cutoff
B.outdraft
C.lockwash
D.springpool


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1.單項(xiàng)選擇題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

3.單項(xiàng)選擇題Your vessel is damaged and is listing to port. The rolling period is short. There is sufficient freeboard so that deck edge submersion is not a problem. What corrective action should be taken FIRST in regard to the vessel’s stability?（）.

A.Press up any slack double-bottom tanks to eliminate free surface
B.Flood any empty double-bottom tanks to add weight low and down
C.Jettison topside weights to reduce KG and KB
D.Shift any off-center weights from port to starboard

4.單項(xiàng)選擇題Your vessel is damaged and listing to port. There is a short rolling period around the angle of list. The portside freeboard is reduced to 1 foot. There is no trim and the weather is calm. You should FIRST（）.

A.press up a slack double bottom tank on the port side
B.fill an empty centerline double bottom tank
C.pump out a slack marine portable tank located on the portside amidships
D.jettison the anchors and anchor cables

5.單項(xiàng)選擇題Your vessel is damaged，listing to port and on occasion flopping to the same angle to starboard. It has a long，slow，sluggish roll around the angle of list. There is excessive trim by the stern with little freeboard aft. What action should you take?（）.

A.Jettison any off-center topside weights to lower GM and correct the list
B.Pump out any slack after double-bottom tanks to reduce free surface and increase freeboard aft
C.Pump out the after peak and fill the forepeak to change the trim
D.Press up any slack double-bottom tanks forward of the tipping center，then fill the forepeak if empty