
Electroacoustics - Audiometric equipment - Part 1: Equipment for pure-tone and speech audiometry (IEC 60645-1:2017); German version EN 60645-1:2017
出版:German Institute for Standardisation (Deutsches Institut f眉r Normung)

專家解讀視頻
Electroacoustics - Audiometric equipment - Part 1: Equipment for pure-tone and speech audiometry (IEC 60645-1:2017); German version EN 60645-1:2017
出版:German Institute for Standardisation (Deutsches Institut f眉r Normung)
專家解讀視頻