Discussed initially the mechanism of polycarboxylic water-reducer improve performance of cracking-resistance of concrete.
初步探讨了聚羧酸减水剂提高混凝土抗劈裂性能机理。
The aging mechanism and aging behavior of polyacetal in boiling water and the methods to improve its resistance to toiling water were discussed.
讨论了聚甲醛的沸水老化机理、沸水老化行为及改善聚甲醛耐沸水性的方法。
The effect of intermittent irrigation on the drought resistance in rice and the physiological mechanism was studied in water keeping off cement ponds.
在挡雨水泥池中研究了间歇灌溉对水稻抗旱性的影响及其生理机制。
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