试题与答案

If an attempt is made to hoist a load that

题型:单项选择题

题目:

If an attempt is made to hoist a load that exceeds the capacity of an electric winch,an overload safety device causes a circuit breaker to cut off the current to the winch motor().

A.when the line pull reaches the rated winch capacity

B.after the line pull exceeds the rated winch capacity

C.after a short build-up of torque

D.immediately

答案:

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