地震地面运动功率谱模型采用两次过滤白噪声模型，建立了地震地面运动谱强度与最大加速度均值之间的关系。
Its power spectral model is the twice-filtered white noise model. Moreover, the relation between the power spectral intensity and the mean value of maximum ground acceleration is set up.
过滤器的过滤网一年至少要维护两次。
The strainer screen should be serviced at least twice a year.
采用两次中和、两次絮凝沉降、一次真空过滤、一次冷却降温工艺处理水洗净化的污水，实现了封闭循环，达到了零排放。
With double stage neutralization, double stage flocculation settlement, one stage vacuum filtration, and one stage cooling, the new process for treatment of waste water coming from the wate...
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