混频器主结构采用两只对称的单平衡混频器组合，通过上下两路信号移相来达到消除镜频的目的。
The main structure of the mixer adopts two symmetrical single-balanced mixers, with phase-shifting of the up and down path signals to eliminate the image frequency.
系统的成功开发还将解决以往税务机关与纳税人之间，上下级之间和税务机关之间存在的信息不对称问题。
The successful development of the system will be resolved between the tax authorities and taxpayers, and between higher and lower levels of information asymmetry that exists between tax authorities.
在3g移动通信系统中，主要业务是上下行速率严重不对称的多媒体数据业务。
In 3g mobile communication systems, main services are multimedia data services, of which the traffic is seriously asymmetric between uplink and downlink.
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