图a所示电路的等效戴维宁电路如图b所示。已知图b中US=8V，则图a中理想电流源IS的值应是（   ）。图a     图b

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69473' and id < 4501215 and id<>'4501215' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69473' and id > 4501215 and id<>'4501215' order by id asc limit 5