| 标准编号 | BS 2497-7:1988, ISO 389:1985/ADD 2:1986 |
| 标准名称 | Standard reference zero for the calibration of pure tone air conduction audiometers. Specification for a standard reference zero at frequencies intermediate between those given in Parts 5 and 6 of BS 2497 |
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| 废止日期 | 1992-02-28 |
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