The local ablation of thermal insulationbarrier in nozzle convergence region and of throat insert is analysed.
分析了喷管收敛段绝热层及喉衬的局部烧蚀问题；
2
When gardens are planted directly on the roof, a waterproof membrane is laid down first, followed by insulation and a root barrier.
当花园直接种植在屋顶上，防水膜放在最下层，其次是隔热和根障。
3
About the sound insulation effect, PC board is internationally recognized as the first selection of highway noise barrier material, it can even 40 decibels of sound insulation.