机械类：工程机械、包装印刷机械、建筑机械、农牧机械及配套设备与产品。
Machinery Category: engineering machinery, packaging and printing machinery, construction machinery, farming and stockbreeding machinery and auxiliary equipment and products.
自由式磨料磨损现象在农业机械、工程机械、煤炭机械、建筑机械等工程领域中广泛存在，是导致这些机械与自由式磨料接触的工作部件的主要失效形式之一。
The phenomena of free abrasive wear widely occur in the working components of agricultural machines, earthmoving machines, coal-mining machines, construction machines and others.
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