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CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
CDL Doubles and Triples Practice Test
Question 1 of 3
How can you check to make sure that trailer height is correct before coupling?
A
Use a landmark like a nearby tree
B
All of these are correct
C
Use both side view mirrors
D
Raise the landing gear completely
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