public void AlegeZeceIntrebari()
        {
            nrIntrebari = L.Count;
            a = new Intrebare[11];
            Random w = new Random();
            int[] t = new int[11];
            int k = 0; // Cate intrebari distincte am ales
            while (k < 10)
            {
                int p = w.Next(nrIntrebari);
                int gasit = 0;
                for (int i = 1; i <= k; i++)
                    if (t[i] == p) gasit = 1;
                if (gasit == 0) t[++k] = p;
            }
            for (int i = 1; i <= 10; i++)
                a[i] = L[t[i]];
        }