单项选择题
In a twin screw ship going half-ahead，both screws turning outboard and the rudder amidships，no current or wind，the vessel will（）.
A.Move bodily to port B.Move bodily to starboard C.Move in a zig-zag motion D.Steer a fairly straight course
单项选择题 In a married falls rig at the after end of a hatch，a boom is rigged in a fore and aft line through its heel.Stresses on the outboard guy will be LEAST if the guy is made fast at a point（）.
单项选择题 Flanking rudders effect a vessel’s heading because of the（）.
单项选择题 Cribbing is（）.
