The dielectric coefficients of hematite ores measured in audio frequency range are always large in value, and show that hematite is a special dielectric.
在声频范围内测得赤铁矿介电系数值较大，说明它是一种特殊的电介质。
Existing predominantly, in the Very Low frequency part of the radio spectrum that corresponds with the audio frequency range, we can experience this activity as audible sound.
尽管这种活动主要存在于无线电声音频率分区的超低频区域，我们还是能够通过听觉来捕捉到它。
Audio transformer: Large transmission power, wide frequency range, stable performance. Used for telephone, fax machine, VCD, DVD, and audio etc.
详细信息：高传输功率，工作频率宽，性能问题。适用于电话机、真机、CD、VD音响设备中。
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