某同学在探究“鱼鳍在游泳中的作用 时将鲫鱼的胸鳍和腹鳍捆�好放入水中观察到的现象是 A.只能上浮不能下沉b.游动时鱼体常常侧翻不 Template




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tomski某同学在探究“鱼鳍在游泳中的作用 时将鲫鱼的胸鳍和腹鳍捆�好放入水中观察到的现象是 a.只能上浮不能下沉b.游动时鱼体常常侧翻不 coloring