提出基于组合计数原理的递归算法，用于多模块变形机器人的非同构构形的计数，并根据构形矩阵对对机器人的对称构形进行判断。
According to combination principle, recursive algorithm has been proposed to enumerate and decide the non-isomorphic configurations and non-isomorphic symmetry configurations.
根据试验要求和厂房结构形式，本论文的模型试验在发电机层采用拱顶送风系统，风口对称均匀布置，选取5种风口布置方案。
Adopt arch crest as air supply system, arrangement vents symmetry, and select 5 kinds of vents to arrange the project, according to the experiment request and factory premises construction form.
通过引进表示经济衰退的解释变量，我们检验了中国实际季度GD P序列当中存在的非对称性，说明这些非对称性主要是由模型的非线性结构形成的。
By inducing the measurements of recession degree, we have tested the asymmetry in quarterly real GDP data of China's economy, and showed that it is caused by the nonlinear structural model.
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