美利体育登录入口官网:JIS K 7039:1998 塑料管道系统.玻璃纤维增强热固性塑料(GRP)管道.在潮湿条件下长期最终弯曲应力的测定和长期最终相应环偏移度的计算
Plastics piping systems -- Glass-reinforced thermosetting plastics (GRP) pipes -- Determination of the long-term ultimate bending strain and calculation of the long-term ultimate relative ring deflection, both under wet conditions