关于互易定理以下说法正确的是
A. 互易定理只适用于线性电路,不适用于非线性电路
B. 含有受控源网络也能满足互易定理
C. 在含有多个激励源的电路中,互易性就是将两个激励交换位置
英译汉。LANs consist of carefully selected groups of components (hardware and software).
英译汉。7 Most wide area networks, such as the PSTN, use a mesh (sometimes referred to as a network)topology.
英译汉。8 Twisted pair, coaxial cable and optical fibre are the three main types of transmission medium used for LANs.