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What is semi-tractor and trailer can be use for?

Sagot :

Explanation:

A semi-trailer truck, also known as a semitruck, (or semi, eighteen-wheeler, or, by synecdoche, a semitrailer) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel.