当观察活鱼时会�现鱼总是不断地用口吞水由鳃孔排出其意义在于 A.吞水冲击食物磨碎食物b.�取食物c.有利于鳃部进行气体交换d.吞水 Template




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tomski当观察活鱼时会�现鱼总是不断地用口吞水由鳃孔排出其意义在于 a.吞水冲击食物磨碎食物b.�取食物c.有利于鳃部进行气体交换d.吞水 coloring