欧美国产亚洲精品_欧美日韩一二三久久久_麻豆免费版的在线直播平台_五月婷婷大香蕉久久_好男人资源免费社区_97视频国产成人青草_狼友网站在线观看_日韩成动漫无码精品_日本无遮羞肉体动漫在线观看_惠民福利香港三日本8a三级少妇三级99

With the development of modern cities, the increase of noise sources, the use of dense, high-strength lightweight materials with the development of modern cities, the increase of noise sources, the use of dense, high-strength lightweight materials.

Sound can be transmitted through air and solid. The solid mainly propagates resonance caused by low frequency and low frequency. The energy and speed of solid propagation are very large and fast. For example, the sound of the subwoofer is mainly transmitted by solid. In the case of solid propagation, it is necessary to consider the vibration isolation system, and design the floating structure according to the situation on your site, such as bearing capacity. The air mainly transmits high-frequency sounds such as sounds that are relatively crisp, and the high-density combined sound-insulating materials can well block the sound transmission through the air. The density of the material you use is proportional to the sound insulation. Do a good job in these two aspects while paying attention to the handling of doors, windows, exhaust pipes, air conditioning pipes, etc. The plan, materials and construction should be well matched. It can be done very well. You can choose the construction materials and methods according to your site.