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1.
When coupling a tractor to a semi-trailer, in what sequence should the airlines be connected to the trailer?
A.
Before backing under the trailer and connecting the king pin to the 5th wheel
B.
Before backing under the trailer if it is not equipped with spring brakes; after hooking the king pin to the 5th wheel if the trailer is equipped with spring brakes
C.
After cranking up the landing gear
D.
b and c are correct
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