汤逊理论主要用于解释（    ）的气体放电。  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69491' and id < 4501656 and id<>'4501656' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69491' and id > 4501656 and id<>'4501656' order by id asc limit 5