The general circle loop theory was put forward, mathematical models were set up, and four basic types were given.

提出广义圆环论，建立数学模型，给出四种基本类型。

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The general circle loop theory was put forward, mathematical models were set up, and four basic types were given.

提出广义圆环论，建立数学模型，给出四种基本类型。

youdao