单项选择题
On no account（）to be exceeded.
A.is the SWL of the crane
B.are the SWL of the crane
C.the SWL of the crane is
D.the SWL of the crane are
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相关考题
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Official draft measurements should be（）by authorized persons，agreed by both parties involved.
A.executed
B.located
C.fixed
D.measured -
单项选择题
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 -
单项选择题
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
