أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
Sorry, I am not into building tunnels and can not give you an answer on this subject,
however having worked in the railroad industry... I believe ISO has some regulations on the railroad industry
en.wikipedia.org/wiki/Railroad_tunnel
www.fhwa.dot.gov/bridge/tunnel/qa.cfm ... such as for compressed air tunnel ... information about the air capacity that is need in basic design of ventilation for railroad tunnels in rural area.
هل تحتاج لمساعدة في كتابة سيرة ذاتية تحتوي على الكلمات الدلالية التي يبحث عنها أصحاب العمل؟