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2026 Iowa DMV Combination Class A Test 2
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Question Number 1
1. Before a trip, you can make sure air flows to all trailers by:
Checking for moving air inside of each trailer.
Listening for air at the rear shut-off valve.
Feeling for air at the front shut-off valve.
✔ Correct Answer:
Listening for air at the rear shut-off valve.
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