若固体介质导热系数大，则热击穿电压上升()

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69412' and id < 4494224 and id<>'4494224' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69412' and id > 4494224 and id<>'4494224' order by id asc limit 5