The present invention relates to transmitting a downlink reference signal in a wireless communication system. Each contact level has a conductive layer and an insulation layer. Service information of a subscriber is collected, and physical layer target parameters are obtained according to Quality of Experience parameters corresponding to the service information. Both the impeller and the turbine are immersed in magnetorheological fluid. The information processing device calculates, as a position in the virtual space, a position on the surface determined by the input position. The wear plates provide a substantially continuous and smooth hard faced sliding surface that facilitates the smooth flow of materials over the surface of the blade.