测量肘关节伸屈活动范围时，测角计的轴心应放在（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25686' and id < 2158738 and id<>'2158738' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25686' and id > 2158738 and id<>'2158738' order by id asc limit 5