(1)鱼嘴张开时,鱼头两侧的腮盖如何变化?(2)你认为这两种结构在鱼的水生生活中起什么作用?
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![(1)鱼嘴张开时,鱼头两侧的腮盖如何变化?(2)你认为这两种结构在鱼的水生生活中起什么作用?](/uploads/image/z/2789941-13-1.jpg?t=%EF%BC%881%EF%BC%89%E9%B1%BC%E5%98%B4%E5%BC%A0%E5%BC%80%E6%97%B6%2C%E9%B1%BC%E5%A4%B4%E4%B8%A4%E4%BE%A7%E7%9A%84%E8%85%AE%E7%9B%96%E5%A6%82%E4%BD%95%E5%8F%98%E5%8C%96%3F%EF%BC%882%EF%BC%89%E4%BD%A0%E8%AE%A4%E4%B8%BA%E8%BF%99%E4%B8%A4%E7%A7%8D%E7%BB%93%E6%9E%84%E5%9C%A8%E9%B1%BC%E7%9A%84%E6%B0%B4%E7%94%9F%E7%94%9F%E6%B4%BB%E4%B8%AD%E8%B5%B7%E4%BB%80%E4%B9%88%E4%BD%9C%E7%94%A8%3F)
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