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工程机械在国民经济中占有相当重要的地位,近年来它随着我国国民经济的发展而高速发展,其提高幅度超过我国其它机械行业的平均增长水平。挖掘
Construction machinery occupies a very important position in the national economy. In recent years, it has developed rapidly with the development of China’s national economy. Its increase rate has exceeded the average growth level of other machinery industries in China. Excavate