A.正極、負(fù)極、信號(hào)電極B.工作電極、電源正極、電源負(fù)極C.工作電極、對(duì)地電極、參比電極D.電源正極、信號(hào)正極、信號(hào)負(fù)極
A.鉆臺(tái)B.儀器房頂C.儀器房D.地質(zhì)房
A.0-200PPmB.0-100PPmC.0-100%D.0-1%