Answer 8: The airport light rail is a reserved line according to the Nanjing Urban Rail Communication Network Planning, on which no specific research has been conducted.
答：机场轻轨线为南京城市轨道交通线网规划中的远期预留线路，目前还没有开展具体的研究工作。
The design of reliable high speed communication systems for power line communication (PLC) requires an accurate knowledge of such channel specific characteristics as attenuation, impedance and noise.
为了设计基于电力线通信（ PLC）的高速可靠通信系统，必须了解衰耗、阻抗、噪声等电力线信道特性。
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