單項選擇題Sidewise force of the propeller tends to throw a vessel’s stern to the right or left,depending on rotation. This force is caused by().

A.back current from the rudder
B.greater pressure on the right or left side of the propeller,depending on rotation
C.lower pressure on the right or left side of the propeller,depending on rotation
D.torque from the velocity and angle at which the surrounding water impinges upon the propeller blades


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2.單項選擇題Panting frames are located in the().

A.after double bottoms
B.centerline tanks on tankers
C.fore and after peaks
D.forward double bottoms

4.單項選擇題Metal plates that cover the top of the hawsepipe are called().

A.footings
B.plugs
C.buckler plates
D.stop waters

5.單項選擇題Many vessels are provided with flume tanks,which also have a dump tank located under the flume tanks. In the event the ship is damaged,you could dump the flume tanks into the dump tank which would().

A.reduce the free surface effect and raise the KG
B.not have any effect on free surface and raise the KG
C.reduce the free surface effect and lower the KG
D.not have any effect on free surface and lower the KG