A crystal substrate and a crystal film of a III-V compound of the nitride system which are manufactured easily and have few dislocations. At least one pressing piece is fastened to a rocker for moving a sealing element, in fact in a position of adjustment for adjusting a fixed valve stroke. The device performs channel estimation processing and decoding processing on the plurality of received OFDM signals, and weights the plurality of received OFDM signals by weight vectors chosen to improve a performance of the plurality of received OFDM signals. In addition, the oxidation is performed at a comparatively low temperature, so that the problem of difficulty in controlling a threshold voltage as the dopant doped at the lower portion of the gate oxide film is diffused outwardly is solved. The outlet comprises at least two walls, each with a respective slit thereon adapted to open to release fluid therefrom when a predetermined pressure is applied to the fluid in the dispenser at the outlet, and to close to retain fluid in the dispenser at a pressure less than the predetermined pressure.