According to the worn characteristics of common wear-resistant material under normal condition, microstructure and metallurgical structure of this kind of materials have been summarized in detail.
针对常用耐磨材料在磨损工况中的损伤特点，总结用于这类工况材料应具备的微观组织及各组成相的性能特点。
Under normal condition, the fibrinogen half-life is 3 to 4 days.
正常情况下，纤维蛋白原半衰期为3 ~ 4天。
The other parts of the system where maintenance is required are the diaphragm valves. Under normal condition, the valve's diaphragm should be replaced every two years.
系统的其它部分的维护如隔膜阀的维护也是必须的。在正常条件下，阀的隔膜每两年需要更换一次。
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