A method and a system may be provided to sample media content similar to media content enjoyed by a user. The present invention can effectively use resources consumed under a multiuser MIMO system and drastically improve the system performance. The airbag cover has, at the location of the film plate, at least a partial support for the film plate and the film plate has an embossed structure on its lower side, which is visible on the upper side. After the supply of dental floss is depleted, the toothbrush may be disposed of. Said method is characterized in that a ligand of the formula is reacted with an iron or manganese salt in a heterogeneous reaction in the diol or polyol, the monoethers or mixtures of these substances. A flange portion obtained by crimping and folding the wall portions at both sides of the diameter-reduced portion in an axial direction according to a press working is formed so as to be continuously provided in an inner diameter side of one end of the tubular portion, and the flange portion is clamped between a mounting bracket and a support member.