ONORM EN 21683:1994被替代
Acoustics - Preferred Reference Quantities For Acoustic Levels
出版：Osterreichisches Normungsinstitut
专家解读视频
Specifies reference quantities and gives definitions of some levels for acoustics. Also gives detailed definitions.
NBN EN 21683:1995 - Identical
I.S. EN 21683:1994 - Identical
ISO 1683:1983 - Identical
NF EN 21683:1994 - Identical
UNI EN 21683:1995 - Identical
UNE EN 21683:1995 - Identical
SS EN 21683 Ed. 1 (1994) - Identical
SN EN 21683:1994 - Identical
DIN EN 21683 (1994-09) - Identical
BS EN 21683:1994 - Identical
