... a 90mm thick wall of noise volume of 43dB9).simpler and more modern construction10).walls can be nailed =single-point ... , railway, highway, water conservancy project, electric power, business, tourism and military use. The houses are all air-tight, heat-tight ... , warm-keeping, water-proof and anti-corrosiveAdvantage:1)reduce transport costs2)better working environment3)wall ...