逻辑斯谛增长曲线的5个期中，个体数达到饱和密度一半（即K/2时）称为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29863' and id < 2422555 and id<>'2422555' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29863' and id > 2422555 and id<>'2422555' order by id asc limit 5