单口网络，其入端阻抗形式是Z=R+jX，当X>0时,单口网络呈(     )性质；当X<0时,单口网络呈(     )性质；当X=0时,单口网络呈(      )性质。  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id < 4420867 and id<>'4420867' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id > 4420867 and id<>'4420867' order by id asc limit 5