习题图2所示机构中，机构自由度的数目是（  ）。 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='8346' and id < 673503 and id<>'673503' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='8346' and id > 673503 and id<>'673503' order by id asc limit 5