The contractive rates on both sides in symmetric part were basically of the same for horizontal pouring while of extreme difference for vertical pouring.
采用水平卧式浇注，铸件对称的两边收缩率基本相同；而采用垂直立式浇注，铸件对称的上下收缩率相差较大。
XML encryption allows applications to encrypt part or all of an XML document using references to pre-agreed symmetric keys.
xml加密允许应用程序使用对预先约定的对称密钥的引用来加密部分或全部XML文档。
Corrigendum 1 - Information technology — Security techniques — Key management — Part 2: Mechanisms using symmetric techniques.
勘误表1 - - -信息技术- - -安全性技术- - -关键管理- - -第2部分：使用对称技术机制。
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