高频电话通道 high-frequency telephone channel 高频电火花加工 high-frequency electric spark machining ..
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high frequency telephone channel 高频电话通道
very high frequency radio-telephone channel 甚高频无线电话波道
High-frequency band-pass filters(several hundred MHz) are used for Channel selection in telephone central offices.
高频带通滤波器（几百 MHz）用于电 话中心局的信道选择。
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