BS EN ISO 389-4:1999现行
Acoustics. Reference zero for the calibration of audiometric equipment. Reference levels for narrow-band masking noise
出版：British Standards Institution
专家解读视频
© British Standards Institution 2013
Amendment notes:
AMD 10484 published 15 July 1999
Document identifier notes:
Formerly BS ISO 389-4:1994.
NS EN ISO 389-4 Ed. 1 (1999) - Identical
SN EN ISO 389-4:1999 - Identical
NEN EN ISO 389-4:1999 - Identical
DIN EN ISO 389-4 (1999-07) - Identical
ONORM EN ISO 389-4:1999 - Identical
NF EN ISO 389-4:1999 - Identical
NBN EN ISO 389-4:1999 - Identical
UNI EN ISO 389-4:1999 - Identical
I.S. EN ISO 389-4:1999 - Identical
UNE EN ISO 389-4:1999 - Identical
SS EN ISO 389-4 Ed. 1 (1999) - Identical
ISO 389-4:1994 - Identical
