下图所示正弦电路发生谐振，电流表A1、A2的读数是4A和3A，则电流表A3的读数是（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id < 4500043 and id<>'4500043' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id > 4500043 and id<>'4500043' order by id asc limit 5