什么是声学EN20140标准

EN 20140-9-1993 声学 建筑物和建筑构件的隔声测量 第9部分：上方有压力通风室的悬挂天花板的空气声隔声的实验室测量(Acoustics - Measurement of sound insulation in buildings and of building elements - Part 9: Laboratory measurement of room-to-room airborne sound insulation of a suspended ceiling with a plenum above it (ISO 140-9:1985))