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 controlling factors for the development of gravity-flow deposits on prodelta slope are deltaic progradation and the double-layer structure of the slope.
前三角洲斜坡发育重力流的主要控制因素是三角洲的快速进积作用和前三角洲斜坡自身存在的二元结构。
The present invention discloses a toothpaste packaging bag with double-layer structure.
本发明公开了一种双层结构的牙膏包装袋。
The present invention discloses a toothpaste packaging bag with double-layer structure.
本发明公开了一种双层结构的牙膏包装袋。
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