单选题Electric cargo winches have an overload safety device which normally cuts the current to the winch motor（）.Aafter torque cause line pull to exceed the rated capacity of the winchBbefore the line pull reaches the rated capacity of the winchCwhen the line pull reaches the breaking strengh of the fallDbefore the safe working load of the fall is reached
单选题
Electric cargo winches have an overload safety device which normally cuts the current to the winch motor（）.
A
after torque cause line pull to exceed the rated capacity of the winch
B
before the line pull reaches the rated capacity of the winch
C
when the line pull reaches the breaking strengh of the fall
D
before the safe working load of the fall is reached
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