The present study is devoted to the selection of innovative materials based on their life cycle of the gas pipeline. Assessment of the efficiency of laying gas pipelines is currently carried out only from the position of construction and installation works and does not take into account the interests of organizations that provide their maintenance and major repairs. Increasing the eff... https://cxaecx8c9ga4.collectblogs.com/79711823/analysis-of-self-perceived-physical-fitness-of-physical-education-students-in-public-schools-in-extremadura-spain