血糖浓度低时，脑仍能摄取葡萄糖而肝不能是因为（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27523' and id < 2271047 and id<>'2271047' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27523' and id > 2271047 and id<>'2271047' order by id asc limit 5