达到独立行走功能的必要条件为双下肢承担（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25689' and id < 2159322 and id<>'2159322' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25689' and id > 2159322 and id<>'2159322' order by id asc limit 5