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ＴＢ/Ｔ 2 0 92 - 1 989《预应力混凝土铁路桥简支梁静载弯曲抗裂试验方法》第 1号修改单 本修改单经铁道部科学技术司于 2 0 0 2年 7月 17日科技技函 [2 0 0 2 ]85号批准 ,自批准之日起实施。修 改 内 容一、2 .1条ｅ修改为“ｅ.正常生产条件下 ,每批 30孔或连续三个月
TB / T 2 0 92 - 1 989 “prestressed concrete railway bridge simply supported beam bending test method” No. 1 a single revision of the Ministry of Railways Division of Science and Technology in July 17, 2002 Science and Technology Letter [2 0 0 2] 85 approved, since the date of approval. Amendment to Article 2.1 e is revised to "e. Under normal production conditions, each batch of 30 holes or for three consecutive months