.已知接成Y形的三个电阻都是30欧姆，则等效的三角形的三个电阻阻值为（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69454' and id < 4497903 and id<>'4497903' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69454' and id > 4497903 and id<>'4497903' order by id asc limit 5