An airflow deflector guides the airflow between a towing machine and a transported unit adjoining the towing machine in the travel direction and is coupled with a setting system for adjusting the orientation of the airflow deflector as needed. The apparatus of the present invention, are containment members for at least partially containing the vulnerable tissue site, thus preventing or minimizing the further vulnerability or growth of the site. The impurity concentration of the second diffusion region forming the first ballast resistance 4 is set lower than the impurity concentration of the fourth diffusion region for forming the second ballast resistance 6.