你可能感興趣的試題

單項選擇題

Most pedestal crane power is provided by（）.

A.Electro-hydraulic units
B.Steam units
C.Independent internal combustion power units
D.All of the above

單項選擇題

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

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Official draft measurements should be（）by authorized persons，agreed by both parties involved.

你可能感興趣的試題

Most pedestal crane power is provided by（）.

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（）.

Official draft measurements should be（）by authorized persons，agreed by both parties involved.

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（）.