液压传动的动力元件是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24896' and id < 2124578 and id<>'2124578' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24896' and id > 2124578 and id<>'2124578' order by id asc limit 5