Anh
base area
direct surface
primary surface
Đức
Grundflaeche
Primaerheizflaeche
Pháp
aire de base
surface directe
surface primaire
Grundflaeche /TECH/
[DE] Grundflaeche
[EN] base area
[FR] aire de base
Grundflaeche,Primaerheizflaeche /SCIENCE,ENG-MECHANICAL/
[DE] Grundflaeche; Primaerheizflaeche
[EN] direct surface; primary surface
[FR] surface directe; surface primaire