The accident emergency rescue of extra long highway tunnel has become a focus in tunnel operation.

特长公路隧道的安全应急管理研究，已成为隧道工程中迫切需要解决的课题。

youdao

The accident emergency rescue of extra long highway tunnel has become a focus in tunnel operation.

特长公路隧道的安全应急管理研究，已成为隧道工程中迫切需要解决的课题。

youdao