??????? ????????? ?? ???????? ?? ????? ? ?????????? ?? ????????? ?? ??????? ????? *?????????? ??????????? ????????????, ??????, ???????? ?, ???????, ?????????: ??????????????????? ????????????. ?? ???? ?????? ??????? ??????? ???????? ?? ??????? ????????, ??? ?? ?????? ?????????????? ?????????.A bulldozer is actually a observe-type tractor having a