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While cranking out a quadrantal davit，slippage of the quadrant due to excessive wear or failure of the teeth in the quadrant will cause the（）.
A:Davit arm to pivot on the traveling nut and the head to fall outboard
B:Traveling nut to lock up in place on the worm gear
C:Limit switch to engage and hold the traveling nut in position
D:Winch brake to lock in position and prevent lowering the boat

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出自：海船船员证

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