A.17MΩ·cm B.18.2MΩ·cm C.19MΩ·cm D.20MΩ·cm
A.6~9 B.6~8.5 C.5.0~7.5 D.6.5~8.5
A.0.0548μs/cm B.0.6μs/cm C.1.0μs/cm D.5.0μs/cm