Q
78. What is the emergency air line?
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Aa. Air lines connecting the parking brake to the trailer brakes.
Bb. Air lines that control the emergency brakes of the tractor.
Cc. Air lines that control the emergency brakes on combination vehicles.
Detailed Explanation
The correct answer is "c. Air lines that control the emergency brakes on combination vehicles.". This is based on federal CDL regulations and safety standards.
Correct Answer: c. Air lines that control the emergency brakes on combination vehicles.
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