最小安全净距是指在这一距离下，出现（  ）都不致使空气间隙被击穿 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69485' and id < 4500631 and id<>'4500631' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69485' and id > 4500631 and id<>'4500631' order by id asc limit 5