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牡丹江林业管理局科学研究所娄茂达同志来信询问有关机械振动、噪声测试标准方面的有关问题,今请郭营川同志解答如下:
Comrade Lou Maoda from the Mudanjiang Forestry Administration Science Institute sent a letter asking relevant questions about mechanical vibration and noise testing standards. Now, please ask Comrade Guo Yingchuan to answer the following questions: