当毛细血管血液的还原血红蛋白超过下列哪项时，皮肤黏膜即可出现发绀

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30511' and id < 2463755 and id<>'2463755' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30511' and id > 2463755 and id<>'2463755' order by id asc limit 5