Before uncoupling a tractor from a semi-trailer, which of the following should be done?

A. ensure the trailer parking brakes are released
B. apply the trailer service brakes
C. lower the trailer dolly legs and raise to take some weight off the tractor
D. ensure the 5th wheel main and secondary locks are both fully engaged


Answer: C

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The basic assumptions of expectancy theory include all the following EXCEPT that

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