.某一有源二端线性网络如左图所示，已知：US1=1V，IS1=2A。该网络的戴维宁等效电压源如右图所示，其中US值为（   ）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69505' and id < 4502632 and id<>'4502632' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69505' and id > 4502632 and id<>'4502632' order by id asc limit 5