吗啡急性中毒致死的主要原因是（  ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='24968' and id < 2127265 and id<>'2127265' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24968' and id > 2127265 and id<>'2127265' order by id asc limit 5