economical service life的意思|示意

The regulations determine the efficiency and the service life of diamond drill, and also the safety, the credibility and the economical efficiency.

金刚石钻进的钻进规程决定了钻进效率和钻头的使用寿命，也决定了钻进的安全性、可靠性和经济效益。

The calculation equation of the economic insulating layer thickness in different service life was (derived) through the life cycle economical analysis of the mini-cold storage.

通过有限生命周期内微型冷库经济性能的分析，推导了微型冷库在使用年限不同时的经济保温层厚度计算公式。

Bonded composite repair has been recognized as an efficient and economical method to extend the service life 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。

PDC bit has long service life, which can improve drilling efficiency with obvious economical benefit.

实践证明，PD C钻头使用寿命长，在提高钻进效率的同时经济效益显著。

It is most economical and effective to renew the load carrying capability and extend the service life by employing composite patches for repair of damaged metallic aircraft structures.

采用复合材料补片对损伤的金属飞机结构进行胶接修理，可以经济而有效地恢复结构的承载能力和延长结构的使用寿命。

Poor durability, short service life 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。