| 摘要 |
Respective heat values of a plurality of electrode pairs P 1 to P 8 are set individually such that the temperatures of all of the plurality of electrode pairs (P 1 to P 8 ) are kept within an appropriate temperature range in which a temperature no lower than a self-cleaning temperature is set as a lower limit temperature and a lower temperature than a pre-ignition temperature is set as an upper limit temperature.
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