Тест CDL №1 - Combination

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Which answer is correct for the air valves when testing the trailer spring / parking brakes only?

A. No answers are correct

B. Service Brake: off; Parking Brake: off; Trailer air supply: out; Trolley: released

C. Service Brake: off; Parking Brake: off; Trailer air supply: out; Trolley: applied

D. Service Brake: off; Parking Brake: off; Trailer air supply: in / open; Trolley: released