图示电路接于对称三相电源。S接通时，A1、A2、A3读数均为17.3A；当S断开时，各表的读数变为：（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69474' and id < 4499669 and id<>'4499669' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69474' and id > 4499669 and id<>'4499669' order by id asc limit 5