下图所示正弦稳态电路中，已知US=120V，XC=48Ω，若开关S闭合和断开电流表的读数均为4A，求R=（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id < 4500050 and id<>'4500050' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id > 4500050 and id<>'4500050' order by id asc limit 5