美利体育登录入口官网:KS M ISO 14828-2016 玻璃纤维增强热固性塑料(GRP)管湿条件下长期比环松弛刚度的测定和湿松弛系数的计算
Glass-reinforced thermosetting plastics (GRP) pipes- Determination of the long-term specific ring relaxation stiffness under wet conditions and calculation of the wet relaxation factor