如下链式存储结构对应的广义表的长度和深度分别为（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30251' and id < 2447198 and id<>'2447198' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30251' and id > 2447198 and id<>'2447198' order by id asc limit 5