用支路电流法求解图2-21所示电洛时，应列写独立的完备的方程数是（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30079' and id < 2435265 and id<>'2435265' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30079' and id > 2435265 and id<>'2435265' order by id asc limit 5