当障碍物的直径大于1/2A时，将发生

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31793' and id < 2541747 and id<>'2541747' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31793' and id > 2541747 and id<>'2541747' order by id asc limit 5