.已知接成三角形形的三个电阻都是30欧姆,则等效的Y形的三个电阻阻值为( )。
发布时间:2025-12-27
A.10欧
B.1两个30欧一个90欧
C.90欧
D.30欧
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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69454' and id < 4497939 and id<>'4497939' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69454' and id > 4497939 and id<>'4497939' order by id asc limit 5
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