从传导速度来看，有髓的神经纤维较无髓的传导速度慢。 （ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30921' and id < 2488486 and id<>'2488486' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30921' and id > 2488486 and id<>'2488486' order by id asc limit 5