A NSA model of impact anechoic chamber ispresented herein theoretically.文章首先经过推导和计算,得出了一套计算紧缩型暗室的归一化场地衰减(NSA)理论值模型.It is the important reference for the evaluation of anechoic chamber performances.为评估全电波暗室的性能提供重要技术依据.Noi...
The auxiliary shaft topsoil adopted ordinary construction and drainages in hygrometric well.屯留煤矿副井井筒表土段采用普通法施工,利用井外降水井疏干降水.This causes environmental damage when the topsoil is washed away by the rains.雨水冲走表层土壤会造成环境破坏。The...
沉积岩的组成大部分为杂砂岩相的浊积岩.The sedimentary members are largely turbidites of greywacke facies.杂砂岩任何含有页岩的多种黑灰色砂岩之一.Any of various dark gray sandstones that contain shale....
在工业过程中, 常用精馏作用把液体混合物分离为纯组分.In industrial processes, liquid mixtures are often separated into their pure components by distillation.讨论用于甲醇生产主精馏塔改进工艺条件下的智能控制方法.An intelligent control method for operation of methanol refini...