The copper-clad invar sheet material prepared by use of said method has the low coefficient of expansion, good radiating capability, large capacitance and good electromagnetic screening effect.

利用本方法制备的覆铜因瓦片材，具有热膨胀系数低，散热性好，电容量大，电磁屏蔽性好；

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Frequency screen is a new high efficiency machine and has the advantages of electromagnetic vibration, high frequency, high capacity and high screening efficiency.

复频筛是一种新型高效的筛分设备，具有电磁振动、高频率、设备处理能力大、筛分效率高等优点。

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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。

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