Taft
发表于 2025-3-21 19:24:37
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爆米花
发表于 2025-3-21 22:51:28
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细查
发表于 2025-3-22 02:53:15
Noise Source Diagnosis and Case Studies,nd control measures encountered in industry, building, and the environment in general. These case studies have been taken from the literature (with permission of the publishers), from a publication from NIOSH (National Institute for Occupational Safety and Health), and from the writer’s own files.
匍匐前进
发表于 2025-3-22 06:21:16
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窗帘等
发表于 2025-3-22 10:47:26
Basics of Sound,hem from enjoying their leisure to the fullest, it can interfere with their sleep, it can result in increased nervous tension with associated psychological effects, and, most particularly, it can result in damage to the audio-sensory mechanism and lead to premature loss of hearing. Noise, like air a
extrovert
发表于 2025-3-22 14:41:16
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收养
发表于 2025-3-22 17:13:19
Sound Fields,r, the incident sound will predominate. Reflections will also occur off objects within the room as well as the walls. If a sound is produced at one point in the room and then stopped, the waves will reflect off various surfaces in a manner similar to light. With no surface absorption reflections wou
怎样才咆哮
发表于 2025-3-22 22:37:10
Absorption, Silencers, Room Acoustics, and Transmission Loss,he energy in an incident sound wave and reduce reflections) and materials which reduce the transmission of sound through the materials. Allied with the absorption of a room is its reverberation characteristics, i.e., the rate at which sound decays in the room.
高度
发表于 2025-3-23 04:44:47
Vibration and Vibration Control, fluid pressure in hydraulic systems, turbulent wind loadings, wave action on structures, ground effects on vehicles, etc. Frequently the disturbing forces can be removed or balanced; if not, their harmful effects can be reduced by proper design of the parts and their mountings.
Yag-Capsulotomy
发表于 2025-3-23 09:21:42
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