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='69476' and id < 4499805 and id<>'4499805' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69476' and id > 4499805 and id<>'4499805' order by id asc limit 5