本文主要对城市噪声的产生源进行了分析，对噪声给人群造成的危害进行了初步探讨，提出了城市噪声的控制对策。

In this paper, the emergence of urban noise sources is analyzed, noise pollution hazards on the crowds causes to a preliminary study, and the urban noise control measures are proposed.

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本文初步探讨了无公害蔬菜种植生产基地的环境评价体系，分析了基地污染因素的来源和对蔬菜造成的危害。

The environmental evaluation system of non-hazardous vegetable bases are discussed, the sources of pollution factors of production bases and harms on vegetables are analyzed.

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本文深入分析了震源车的振动、噪声产生的根源及其危害性，初步探讨了一些降低噪声及振动的措施。

This article analyzes the source and damage of the noise and vibrating of vibra-tor. It also proposes some measures to reduce noise and vibrating.

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