???? ?? ???????? ??????? ?/? ??????, ???????? ????????? ???????????? ??????? ?????????? - ????????? ?????? ???????????? ???? ??????. ? ????????, ???????? ?????????????? ? ??????????? ?? ???????????????? ??????, ?????? ??????? ????????? ?? ????????? ??????????.Slow, controllable speeds are needed for most of the operations done with a tractor. They