单选题The duty of a deck winch is to lift and lower a load by means of a fixed rope on （）.Aa warp endBa mooring winchCa worm gearDa barrel
单选题
The duty of a deck winch is to lift and lower a load by means of a fixed rope on （）.
A
a warp end
B
a mooring winch
C
a worm gear
D
a barrel
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