ISO 717-1-1996/Amd 1-2006 声学.建筑物和建筑构件的隔声等级.第1部分:气载隔声.修改件1:与单数字等级和单数字量有关的舍入规则
Acoustics — Rating of sound insulation in buildings and of building elements — Part 1: Airborne sound insulation — Amendment 1: Rounding rules related to single number ratings and single number quanti