如图所示,此二端口的G参数矩阵为?
A、[1/R -1/R;-1/R 1/R]
B、[-1/R 1/R;1/R -1/R]
C、[1/R 1/R;1/R 1/R]
D、[-1/R -1/R;-1/R -1/R]