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单选题
The cable lifter, mooring drum and warp end of a split windlass may be separately engaged or disengaged means of a （）
A
dog clutch
B
Pair of gears
C
worm gear
D
turning gear
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考题
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mooring barrelC
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单选题（） may be fitted for operating the derrick topping lift (the wire which adjusts the derrick height).A
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