A system for humidifying reactant gas for a fuel cell includes a supply line for supplying reactant gas to a fuel cell, a mist humidifier for producing liquid droplets in the reactant gas, and an evaporator for evaporating the liquid droplets. The evaporator may use a portion of the heat generated by operation of the fuel cell for evaporating the liquid droplets.

 
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> Optical semiconductor device having active layer and carrier recombination layer different from each other

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