A.7 B.3.5 C.12 D.0.35
A.P1-P2+101g(R2/R1)-6(dB) B.P1-P2+101g(R1/R2)-6(dB) C.P1-P2+1g(R2/R1)-6(dB) D.P1-P2+0.51g(R2/R1)-6(dB)
A.75 B.77 C.73 D.100