Poor durability, short servicelife and low economical efficiency of Bridges have become a worldwide difficult problem.
桥梁耐久性差、服务寿命短及全寿命经济性指标差等问题已成为世界性难题。
2
Bonded composite repair has been recognized as an efficient and economical method to extend the servicelife of damaged aircraft metallic structures.
损伤金属飞机结构的复合材料补片胶接修理技术是一项经济而有效的结构延寿方法。
3
The calculation equation of the economic insulating layer thickness in different servicelife was (derived) through the life cycle economical analysis of the mini-cold storage.