At the same time, the manhole cover has the characteristics of insulation, noise free.
同时，这种井盖还具有绝缘、无噪声的特点。
Department of the Air Self-cooling, with a small size, light weight, heat insulation, high-grade characteristics.
系空气自冷式，具有体积小、重量轻、绝缘耐热、等级高的特点。
Department of the Air Self-cooling, with a small size, light weight, heat insulation, high-grade characteristics.
系空气自冷式，具有体积小、重量轻、绝缘耐热、等级高的特点。
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