A water-cooled multi-cylinder engine, includes a control system in which an engine revolution number is reduced to a level less than a restriction revolution number on the basis of at least one condition of misfire and fuel stop for all the cylinders of the engine, at a time of an occurrence of an overheat, so as to restrict an increasing of a temperature of the engine. The inventive system includes a first circuit for distributing an input signal between two or more channels in a current mode of operation. The anode gas diffusion layer, the catalyst-coated membrane and the cathode gas diffusion layer are combined together by a low temperaturelow pressure lamination process. The wavelength variant of each resonant cavity device is determined by the number of layers, thicknesses and compositions of the AlxGa1-xAs oxide tuning layer contained in the selective oxide structure. The second nozzle replenishes brine by flowing water directly onto a salt material. Various types of column blocks are provided for managing the layout of a particular fence system.