单项选择题
A.using a rotary grinder with an installed shield
B.letting go the anchor
C.handling wire rope or natural fiber line
D.painting with a spray gun
单项选择题 Manila lines in which the strands are right-hand laid（）.
单项选择题 In the manufacture of wire rope，if the wires are shaped to conform to the curvature of the finished rope before they are laid up，the rope is called（）.
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（）.