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本文讨论了组合大系统的结构能控性．首先介绍了类仙人掌的图形概念，然后，构造了一种新的图形概念──类仙人掌的串级联结，进而给出了检验不同组合下大系统结构能控的充分条件．获得的结果比原有的结果无论在操作上还是在表达上都有更大的便利性，同时它还加深了我们对结构能控概念的理解．
This article discusses the structural controllability of a large combined system. First of all, we introduced the concept of cacti-like graphics. Then, we constructed a new concept of graphics-cacti-like cascade connection, and then gave sufficient conditions to test the controllability of large-scale system under different combinations. The obtained results are more convenient than the original results both in operation and in expression, and at the same time it deepens our understanding of the concept of structural control.