The present invention provides a synthetic wood including a body containing a polystyrene- or polypropylene-based resin as the major component and a weather-resistant outer layer with excellent adhesion to the body. The filter of the present invention includes an upper capsule member, a lower capsule member, and a filter medium. This error is typically the mean squared error of the system. An annular chamber formed between the shaft outer surface and a radially inner surface of the axially movable disk can be subjected to hydraulic pressure through the connecting bore. A data sample classification from the activated second sensor may be classified jointly with the data from first sensor.