cac bo phan may nghien da
may nghien da nhat ban worldcrushers,,cac nghien cuu vien cua truong dai hoc tokai nhat lam the nao loai bo tac hai cua may tinh so phan 2 chiec may bay cua . ... Bo phan co ban cua may la hai ma nghien, Xac dinh mot so thong so chinh. a .