Techniques are described for reducing inductance in ball grid array packages for integrated circuits. The first main rib extends from a crown side to a sole side, and the second main rib extends from a hosel side to a toe-side part of the sole side, the first and second main ribs intersecting each other. One opening has been adapted to receive a screw of a side arm, the other to receive an ornamental fastener. The determined current or actual load position relative to an optimal position is calculated and displayed along with the weight. The formic acid aqueous is supplied from the chemical liquid tank to the inside of the reactor water recirculation pipeline, and then a ferrite film is formed on the inner surface of the reactor water recirculation pipeline. % or more, the content of hydrocarbon compounds having carbon numbers of 7 and 8 in total is 20 vol.