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Doubles and Triples
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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
Which of the following is a method that you can use to secure a second trailer before coupling?
A
Hook up the air brakes to the emergency line
B
Use wheel chocks
C
Hook up the air brakes to the service line
D
Engage the spring brakes
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