如图所示对称三相电路，电流表A的读数为1A(有效值)。由于故障，A相断开，即断开S，电流表A的读数为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69035' and id < 4471172 and id<>'4471172' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69035' and id > 4471172 and id<>'4471172' order by id asc limit 5