单相半波可控整流电路，所带负载为阻感负载时，晶闸管关断时刻为(    )（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69429' and id < 4496158 and id<>'4496158' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69429' and id > 4496158 and id<>'4496158' order by id asc limit 5