对于线性非时变的无源二端口网络，在零初始条件下，若存在互易性及对称性，则其电路参数具有一定的特殊性。

If reciprocity and symmetry exist for passive two port networks of linear time invariant under zero intial condition, the circuit parameters will have some important characters.

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对于含有线性受控源、或独立电源的电路，当电路结构和元件参数满足一定条件时，也同样具有互易性。

For the circuit including linear controlled source or independent source, it also has reciprocity when the circuit constitution and element parameter satisfy some conditions.

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