概述了轴承常用材料的种类及用途，简述了不同材料的区别、特点以及材料选用原理。
This article Outlines the sorts and application of usual bearing material, and the distinctions, characteristics and the select principles for different bearing materials are introduced.
从理论上分析了消泡剂的消泡原理，概述了消泡剂的选用原则及评价方法。
The antifoaming principles of antifoaming agents were analyzed in theory, and the selection principles and evaluation methods were described.
阐述了自压密封旋启式止回阀的结构特点、工作原理、材料选用和止推环设计。
Describe the structure characteristic and working principle of pressure seal swing check valve. Material selection and thrust ring design.
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