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报道:该矿三大机械(主扇机、压风机和高压泵)的噪声治理结果,1990年对机械车间的三大机械分别建造了隔声观察室。该室由
Reported: The mine three machines (fans, fan and high pressure pump) noise control results, in 1990 on the mechanical workshop of the three major machinery were built sound insulation observation room. The room by