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rang yu xing bian zao fu yu ren lei
Author(s): 
Pages: 41
Year: Issue:  9
Journal: Ocean World

Abstract: <正> 今天,生物的雌雄互变现象已成为人类控制生物性别,提高胚胎经济价值,并直接应用于发展经济的重要手段。黄鳝在一生中都要经历两个发育阶段,即先当“新娘”,后当“新郎”。青春年少时,十有八
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