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8. When coupling, what should you check after connecting the air lines and before raising the landing gear?
9. What is the purpose of the electrical cord connected between the tractor and trailer?
10. During uncoupling, when should you lower the landing gear?
11. What is a sliding fifth wheel used for?
12. What is the bridge weight formula concerned with?
13. What is the proper use of safety chains on a combination vehicle?
14. What happens when you pull out the trailer air supply control (red knob)?
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