The current method to branch wire from the cable trunk is to cut off the trunk line, and crimp two ends of trunk line and the required branch, and pack them, or to bind the branch line to trunk line.

现行的从电缆主干线上取得分支线的方法就是切断主干线，将干线两头和所分的支线一同压接后包裹起来，或是将分支线绑轧在主干线上。

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But fundamental loop analysis method can not be used for approaching the loop analysis problems of the loop containing current source branch.

但是基本的回路分析法不能用于处理含有电流源支路的回路分析问题。

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Then the isomorphism judgment criterion based on the circuit analysis is obtained by applying the circuit laws and the method of branch current to the circuit models.

然后应用电路定律和电路网络分析的支路电流法进行分析，得出了基于电路网络分析的运动链同构判定依据，最后结合实例说明了运动链的同构判定方法。

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