1, the announcement model at the beginning of "b" indicates that the ambulance is a surveillance ambulance. This kind of ambulance is mainly equipped with advanced medical equipment and facilities, which can provide all-round medical monitoring and treatment services.
2. The announcement model at the beginning of "A" indicates that the ambulance is a transshipment ambulance. The main task of this ambulance is to transport patients. Usually, it is not equipped with too complicated medical equipment and facilities, mainly considering the comfort and stability of the vehicle.