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frequency conversion technique
频率搬移技术
在发射端将调制信号从低频端搬移到高频端,便于天线发送或实现不同信号源、不同系统的频分复用的技术。
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Beijing China Ethnic Museum
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Beijing Council International Auction Co.,Ltd
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Beijing Dadu City of YuanDynasty Wall Relics Park
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BEIJING Drama School
Beijing Economic and Technological Development Zone Plan
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