A.1000MΩ·km B.2000MΩ·km C.3000MΩ·km D.4000MΩ·km
A.1MΩ B.1.2MΩ C.1.3MΩ D.1.5MΩ
A.100mm~200mm B.200mm~300mm C.300mm~400mm D.400mm~500mm