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Q

7. You supply air to the trailer tanks by:

Combination Vehiclesmedium

APushing in the trailer air supply valve.

BPulling out the trailer air supply valve.

CConnecting the service line glad hand.

Detailed Explanation

The correct answer is "Pushing in the trailer air supply valve.". This is based on federal CDL regulations and safety standards.

Correct Answer: Pushing in the trailer air supply valve.

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