中華人民共和國國家標準
NATIONAL
STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 4854.7-2008
Acoustics - Reference zero for the calibration of audiometric equipment - Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions 聲學 校準測聽設備的基準零級 第7部分: 自由場與擴散場測聽的基準聽阈
Issued Date:2008-07-02
Implemented Date:2009-02-01
Issued by:
The Standardization Administration of the People's Republic of China