The present invention is a disassembly apparatus and method for disassembling a workpiece having at least two layers joined together by welding or other bonding processes at bonding points. 5 seconds whereby hearing of a sudden sound in a stationary sound environment is facilitated. All electrodes are interconnected within the package by mounting on common conductive surfaces or by wire bonding. By controlling the air supply amount in relation to the fuel supply amount to obtain an excess air factor corresponding to a predetermined rich air-fuel ratio, a part of the air-fuel mixture in the fuel vaporizer is partially oxidized, and the remaining fuel vapor is heated by the oxidation heat. The urethane resin has a structure represented by the following formula, and one or both structures selected from a structure represented by the following formula and a structure represented by the following formula between two adjacent urethane linkages.