观察如图所示的鲫鱼头部回答下列为题1如果观察活鱼的鳃会�现鱼鳃 是鲜红色的这是因为鳃丝内有丰富的 .鳃丝多而细密有利于鱼的血液与 Template




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tomski观察如图所示的鲫鱼头部回答下列为题1如果观察活鱼的鳃会�现鱼鳃 是鲜红色的这是因为鳃丝内有丰富的 .鳃丝多而细密有利于鱼的血液与 coloring