求翻译：本文针对水泥窑头排风离心风机设计首先简要论述了离心风机在新型干法水泥生产线的作用，介绍了一般离心通风机的基本理论和相似理论在通风机中的应用，阐明了离心通风机方案选择的主要条件、相似设计的基本原理和条件、选型的基本过程, 离心通风机的选型设计主要根据气体的流量、压力、密度这三大要素来进行，而在方案的选择时又有许多参考因素或条件需要认真选择、综合考虑，方能选择出最佳的符合工况使用要求的离心通风机。是什么意思？

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