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。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69475' and id < 4499676 and id<>'4499676' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69475' and id > 4499676 and id<>'4499676' order by id asc limit 5