等长练习是指对抗一定的负荷做关节的活动锻炼，同时也锻炼肌肉收缩。 （ )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30909' and id < 2487253 and id<>'2487253' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30909' and id > 2487253 and id<>'2487253' order by id asc limit 5