所谓单相式阻抗继电器，是指只输入一个电压.一个电流的阻抗继电器。（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69377' and id < 4491431 and id<>'4491431' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69377' and id > 4491431 and id<>'4491431' order by id asc limit 5