大量隧道火灾案例表明，烟气和毒气是人员窒息中毒伤亡的主要原因。

Many tunnel fire incidents show most people died from smoke choking and toxic gases.

youdao

大量隧道火灾案例表明，烟气和毒气是人员窒息中毒伤亡的主要原因。

Many tunnel fire incidents show most people died from smoke choking and toxic gases.

youdao