某元件关联方向的电压和电流分别为V，A则电路阻抗Z=（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id < 4420853 and id<>'4420853' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id > 4420853 and id<>'4420853' order by id asc limit 5