单项选择题
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
单项选择题 As to the stained plates，the fault lies（）you.
单项选择题 A virtual rise in the center of gravity may be caused by（）.
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?（）.