In silicate minerals and magnetites existed isomorph tin.

硅酸盐矿物和磁铁矿中都存在类质锡。

According to the concept of context process problem space,. the concept of Directed Assembly Relationship Graph(DARG) was put forward. The isomorph of DARG was defined.

根据上下文工艺问题间的概念,提出了有向装图的概念,定义了有向装图构,以有向装图和零件通用属性来构建实例库。