Q
74. Why should you not use the trailer hand valve while driving?
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Aa. Because it won't work as well as the foot brake.
Bb. Because you should use the parking brake.
Cc. Because of the danger of making the trailer skid.
Detailed Explanation
The correct answer is "c. Because of the danger of making the trailer skid.". This is based on federal CDL regulations and safety standards.
Correct Answer: c. Because of the danger of making the trailer skid.
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