Itwasproposed that defoamers “wearout” with time because the oil is gradually emulsified togive droplets and thus lenses which are too small. 他们提出，消泡剂随着时间而“耗尽”，因为油被逐步乳化而形成小滴，因此透镜也变得太小了。

Keywords Aromatic Polyamide;Frictional Material;Wearout; 芳香聚酰胺;摩擦材料;磨损;

Keywords wearout mechanisms;wear measurements;printing machine; 磨损机理;磨损测试;印刷机;

wear out That job is a wearout, it is cold, dirty. He really wears me out. 他把我整得精疲力竭。

Keywords： CFB Boiler; materialreturning device; expansion; grunting material; wearout 关键词：CFB锅炉；回料阀；膨胀；浇筑料；磨损

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