这是本学期案例分析专题作业中五部分的第四份作业。
This is the fourth assignment in a five-part, semester-long project.
结合成功案例，对现有作业现场提出有效降噪治理方法。
According to successful cases, we put forward a effective method of noise-reduction.
结合成功案例，对现有作业现场提出有效降噪治理方法。
According to successful cases, we put forward a effective method of noise-reduction.
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