The economical model of pipeline insulation is divided into single layer structure and double layer structure types.
保温管道的经济模型分为单层结构和双层结构两种。
The drying efficiency is high. Due to the upper and lower double layer structure, save space and electricity, improve the drying efficiency.
烘干效率高，采用上下双层结构，节省空间与电费，提高烘干效率。
The cover layer on one side of basin has double structure.
盆地一侧的盖层具有双重结构。
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