使用多端口灭弧时，为使触头两端电压平均分配到各断口，应在各断口加装（  ）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69482' and id < 4500356 and id<>'4500356' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69482' and id > 4500356 and id<>'4500356' order by id asc limit 5