临床表现缓慢进行性加重的对称性肌无力，多见于（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25665' and id < 2157048 and id<>'2157048' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25665' and id > 2157048 and id<>'2157048' order by id asc limit 5