单项选择题

Flanking rudders effect a vessel’s heading because of the（）.

A.effect of the propeller flow on the rudders
B.water flow due to the vessel's movement through the water
C.tunnel affect of the water flow past opposing rudders
D.discharge current being channeled to impinge on the vessel's deadwood

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单项选择题A vessel is equipped with twin propellers，both turning outboard with the engines half ahead. If there is no wind or current and the rudders are amidships，what will happen?（）.

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单项选择题A twin-screw vessel with a single rudder is making headway. The engines are full speed ahead. There is no wind or current. Which statement is FALSE?（）.

A.If one screw is stopped，the ship will turn toward the side of the stopped screw
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单项选择题A single-screw vessel going ahead tends to turn more rapidly to port because of propeller（）.

A.discharge current
B.suction current
C.sidewise force
D.thrust