配电装置的最小安全净距中，A1指的是（  ）的距离。  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69485' and id < 4500632 and id<>'4500632' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69485' and id > 4500632 and id<>'4500632' order by id asc limit 5