A steering system has a steering control unit and a ratio adjuster for varying a flow rate amplification ratio of the steering control unit. The system performs data transmission from a first terminal including N antennas to a second terminal including M antennas using spatially multiplexed streams. The characteristic adjustment register is controlled by a self determination circuit. The article can include a chassis with an edge, and a drawstring chamber disposed along at least a portion of the edge, wherein the drawstring member is disposed within the drawstring chamber. 6% by weight or less, and an electrolytic capacitor using the electrolytic solution; and a method for preparing an organic onium tetrafluoroaluminate which is advantageously used in an aluminum electrolytic capacitor.