有源消声技术对于管道中低频噪声的控制非常有效。
The technique of active attenuation of noise is very effective for controlling the low frequency noise in ducts.
目的了解中低频噪声接触对电力生产工人健康的影响，为采取切实有效的防范措施提供依据。
To learn the effect of middle and low frequency noise on the health of electricity producing workers, and to provide basis for finding effective preventive measures.
结论中低频噪声接触导致作业工人听觉系统、神经系统、心血管系统、消化系统以及代谢功能的影响。
Middle and low frequency noise may affect workers' hearing system, nervous system, cardiovascular system, digestive system and metabolism.
低表面能涂层涂覆在铝合金模型上，考察了其在水筒中低频段降低流噪声的效果。
The flow noise reduction of al alloy model with low surface energy coatings have been studied in a water tunnel.
尤其对中低频和各种振动噪声均有良好的吸收效果，十分有利于减少噪音污染，改善工作环境。
Rock wool has good absorption function for medium and low frequency noise and various types of vibration noise. This will be very favorable for reducing noise and improving work environment.
尤其对中低频和各种振动噪声均有良好的吸收效果，十分有利于减少噪音污染，改善工作环境。
Rock wool has good absorption function for medium and low frequency noise and various types of vibration noise. This will be very favorable for reducing noise and improving work environment.
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