A fan includes a frame, a stator, an impeller, and an oil retainer. The fibrous solid carbon manifold assembly has fibrous bodies carbonized, and a limitless number of superfine graphite filaments grown on surfaces of the carbonized fibrous bodies, in the inside of each of said fibrous bodies and in a gap between adjacent ones of said fibrous bodies. In Equations to below, x represents a number average molecular weight of the second resin and y represents a urethane group concentration in the second resin. The golf practice device of the present invention minimizes height between the ground and the top of the practice platform, or step-up height to provide a golf practice device that is easily and comfortably used. A prefetch operation may be performed for each cache miss based on the contents of the correlation table entry corresponding to the index.