4个结点，8条支路的电路结构，可以列写网孔电流方程的个数为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69476' and id < 4499727 and id<>'4499727' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69476' and id > 4499727 and id<>'4499727' order by id asc limit 5