A suction nozzle for a vacuum cleaner that can be connected to a suction pipe andor a suction tube of the vacuum cleaner includes a nozzle part that can be connected to the suction pipe or the suction tube by means of a tubular connection part. By generating a sound or voice through the speaker, the human is requested to cause a robot to make a certain action. The periodic dispensation step periodically dispenses droplets of the liquid through an atomizing unit. The two image scanning units are movably disposed in the housing to project a scanning light through a window of each scanning table respectively, so as to scan images of the two adjacent pages. Also described is a manufacturing process for the above described substantially pore-free, sintered boron carbide materials with high strength and fracture toughness, which can be used for production of large-area parts. The sensor modules 20A to 20D and the base station 30 are arranged in the tire and constitute an intra-tire LAN.