The structure is simple, the screening efficiency is high, and the screening effect is good.
结构简单，分选效率高，分选效果好。
The low frequency screening effect against electromagnetic influence is very strong in urban areas because there are a lot of underground metallic pipes.
城市地区由于存在大量地下金属管道，因而电磁屏蔽效应十分良好。
Screening effect relys upon both absorption loss and reflection loss.
屏蔽效果主要是靠吸收损耗与反射损耗。
Screening effect relys upon both absorption loss and reflection loss.
屏蔽效果主要是靠吸收损耗与反射损耗。
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