某同学为探究鱼鳍在游泳中的作用选取甲乙两条相同的鲤鱼放于同一鱼缸中操作之一是用纱布只捆扎甲的背鳍其他鳍�自然状态请问该步骤探究的是哪 Template




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tomski某同学为探究鱼鳍在游泳中的作用选取甲乙两条相同的鲤鱼放于同一鱼缸中操作之一是用纱布只捆扎甲的背鳍其他鳍�自然状态请问该步骤探究的是哪 coloring