一氧化碳中毒病情严重的危重信号是（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25620' and id < 2155606 and id<>'2155606' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25620' and id > 2155606 and id<>'2155606' order by id asc limit 5