A.0.5m B.0.6m C.0.7m D.0.8m
A.1000MΩ·km B.2000MΩ·km C.3000MΩ·km D.4000MΩ·km
A.1MΩ B.1.2MΩ C.1.3MΩ D.1.5MΩ