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Question
After connecting the air lines to the trailer while coupling, you should:
Answers
A.  Supply air to the trailer.
B.  Chock the wheels.
C.  Inspect the fifth wheel.
D.  Connect the electrical cord.
Explanation
Correctly following the steps to couple and uncouple trailers is vital to safely operating a combination vehicle. After connecting the air lines to the trailer while coupling, you should supply air to the trailer.

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