Previous planning is the reason of some region road traffic noiseindex exceeding;
部分区域噪声污染指标超标与早期规划有关；
2
The noiseindex of YKK Series, which are the main export parts to power station (including nuclear power station), is an important competitive factor in international market.
作为我国电站（包括核电站）主要出口部件的YKK系列电机在国际市场上的竞争力受到噪声指标的影响。
3
Modern axial piston pump in terms of its operating parameters, because of its work pressure and speed continues increasing, the noiseindex requirements become more stringent.