在下图所示正弦交流电路中,用电压表测得U=500V,U1=300V,则U2为( )。
发布时间:2026-01-24
A.200V
B.400V
C.800V
D.500V
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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id < 4500055 and id<>'4500055' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id > 4500055 and id<>'4500055' order by id asc limit 5
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