Immigration, like any other source of population growth, may bring external costs associated with crowding-extra noise, conflict, crime . 象任何别的人口增长来源一样，移民也可能会造成与人口拥挤的种种外部代价--过多的噪声、冲突、犯罪。
The distance between the acoustic-emission source and the receiving transducer, and the background noise level are primary factors in selecting a particular frequency band . 声发射源与接收讯号传感器间的距离以及环境噪声的电平是选择频带的主要依据。
Noise of outside railway rolling stock - test methods 外部铁道车辆噪声.试验方法
Guidelines for the specification of noise of new machinery 新机械噪声规范的指南
Seawater dynamic simulation based on 1 f noise model 基于风噪声模型海水动态仿真
Study of low - frequency noise induced by marine propeller 船舶螺旋桨低频噪声研究
Measuring method for environmental noise of urnan area 城市区域环境噪声测量方法
Research on airplane noise and the strategy of control 飞机噪声及防治对策的研究
Analysis of the artifacts due to mr high noise 高噪声导致图像出现伪影的检查办法
