2025 Maryland Cdl Combination - Test 1
The following questions are from real Maryland CDL practice tests. After selecting the answer, you can see the explanation. After confirming, click "Next" to jump to the next question.
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1. The service air line is attached to the:
Relay valves.
Supply line.
Emergency air line.
Steering wheel.
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Key Data
Number of Tests: 18
Number of Question: 20
Passing Score: 16
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