A multi-leaf collimator includes a number of independently adjustable leaves. The holes in the socket include first and second holes individually extending in the axial direction, the first holes extending closer to the distal end side than the second holes. The process of various service invoking needn’t limit to the service control point of the same manufacture. The interface also displays a pointer that is arranged to move over the timeline, and a second region representing input controls. This washing tub unit contains washing water therein, and carries out both a washing operation and a spin-drying operation for laundry contained therein.