那得是我有空的时候，而且只是局部装配。
根据子装配体的定义给出了利用联接图和局部阻碍图识别子装配体的规则。
The paper also gives the rules of subassembly detection, employing connection graph and local blocking graph, based on the definition of subassembly.
通过对此数学模型的求解，导出了相交双管相贯线上各点局部二面角的计算公式，给出了相交双管装配接触线的参数方程，并解释了其数学本质。
By the solution of the model, a calculating formula of the local dihedral angel of intersecting line and a parametric equation of contacting line are given.
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