检索到 1 条 题名=I.E.C. reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts. 的结果
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西文图书1.International Electrotechnical Commission.[Volume 11] I.E.C. recommendation 121 (1960) - 129 (1961) TM-65/IEC/V.11
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可借复本：1 International Electrotechnical Commission.
International Electrotechnical Commission, ISO], 1960.
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