It covers line and base maintenance, component management, engineering and planning as well as other services.

其中涵盖了航线及基地维修，部件管理，工程规划等服务内容。

youdao

It covers line and base maintenance, component management, engineering and planning as well as other services.

其中涵盖了航线及基地维修，部件管理，工程规划等服务内容。

youdao