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针对2-6岁儿童的一本认知工程车的绘本书。主要讲述城市里、工地上常见的工程挖掘机,包含轮式挖掘机、矿山挖掘机等多种机型,从不同的功能角度着手,配上精美的情景图片和精简的文字,让喜欢大型工程车的小朋友们更加喜爱挖掘机。