植物根的增粗主要是由于（ ）分裂活动的结果。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29830' and id < 2421067 and id<>'2421067' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29830' and id > 2421067 and id<>'2421067' order by id asc limit 5