对材料的选用作了分析。
对原材料的选用、生产配方、生产工艺、技术指标等作了介绍。
Selection of raw materials, product formulation, manufacturing technology and technical indexes were presented.
改良的结构设计和新型材料的选用大大提高了计量泵的汽蚀性能。
The improved structural design and adoption of new materials have greatly improved the cavitation performance of metering pump.
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