单项选择题
A.permits the rudder to move faster
B.generates more power
C.can turn without using her rudder
D.can suck the water away from the rudder
单项选择题 A twin-screw vessel can clear the inboard propeller and maneuver off a pier best by holding a(n)（）.
单项选择题 A twin-screw ship going ahead on the starboard screw only tends to move（）.
单项选择题 A twin screw vessel，making headway with both engines turning ahead，will turn more readily to starboard if you（）.