A.0.22dB/km和0.36dB/km B.0.36dB/km和0.22dB/km C.都為0.22dB/km D.都為0.36dB/km
A.ρ10<100Ω.m B.ρ10<200Ω.m C.ρ10<500Ω.m D.ρ10>500Ω.m