To meet the design requirement and the changing environmental conditions, car hub bearing must have very high reliability.
面对设计要求和环境条件的变化，汽车轮毂轴承必须保持较高的可靠性。
Natural road building materials have a close relation to the engineering quality and cost, and the changing of geologic conditions may cause some design modifications.
天然筑路材料与工程质量及造价有着密切关系，变更设计中有些是由于地质条件的变化而引起的。
It gives a example of optimum design, calculates variation of structure parameters and operating performance under changing operation conditions and shows the calculating results about model tests.
并且给出了优化设计的实例；计算了变工况下的结构参数及运行性能变化，列出了型式试验计算机模拟结果。
It gives a example of optimum design, calculates variation of structure parameters and operating performance under changing operation conditions and shows the calculating results about model tests.
并且给出了优化设计的实例；计算了变工况下的结构参数及运行性能变化，列出了型式试验计算机模拟结果。
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