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CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
CDL Combination Vehicles Practice Test
Question 1 of 3
Why is it important to ensure that the fifth wheel is properly greased?
A
To prevent steering problems
B
To ensure good hose connections
C
To ensure a secure connection to the trailer
D
To ensure good electrical connections
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