髙处作业的悬吊下降系统是由（）组成的。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25786' and id < 2166195 and id<>'2166195' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25786' and id > 2166195 and id<>'2166195' order by id asc limit 5