照明系统中的每一单相回路上，灯具与插座的数量不宜超过（）个。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27219' and id < 2260272 and id<>'2260272' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27219' and id > 2260272 and id<>'2260272' order by id asc limit 5