某对称三相电源Y接，已知，当t=10s时间三个线电压之和为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69389' and id < 4493025 and id<>'4493025' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69389' and id > 4493025 and id<>'4493025' order by id asc limit 5