.某一有源二端线性网络如图a所示，它的戴维宁等效电压源如图b所示，其中US值为（    ）。图a                                       图b

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69307' and id < 4487221 and id<>'4487221' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69307' and id > 4487221 and id<>'4487221' order by id asc limit 5