阐述获取预应力钢材低松弛性能的途径及其影响因素，并探讨其机理。
To expound the approach to get low relaxation property of prestress steel products and its effect factors, and the mechanism is discussed.
目的：研究钙离子诱导的果胶分子在体交联度松弛的机理。
OBJECTIVE: To study the relaxation of in situ crosslinking degree induced by calcium cations in the pectin-based matrix tablets.
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