static void Main(string[] args)
        {
            Avion Av = new Avion("Boeing", 10000, 2010);

            Av.Marche();

            Velo Ve = new Velo("", 0, 0);

            Ve.Marche();

            Bateau Ba = new Bateau("", 0, 0);

            Ba.Marche();

            Camion Ca = new Camion("", 0, 0);

            Ca.Marche();

            Console.ReadLine();
        }