如图4所示，已知是一个无源一端口，则ab两端的等效电阻可能（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69475' and id < 4499678 and id<>'4499678' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69475' and id > 4499678 and id<>'4499678' order by id asc limit 5