An electronic ticket management system mainly includes a vendor module, a ticket process module, a Web module, a ticket order module, a delivery module and a ticket verification module. A rear axle and wheels support the rear portion of the cargo container. One end of the bearing body is extended to project out of the cylindrical portion and the bearing body has a flange at the projecting end. One end of the feedback resistor is connected to an output terminal of the amplifying circuit, and the other end is connected to inverting input terminals of the n differential circuits connected in common.