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piano di riferimento
earth.sc., mech.eng.	Ausgangsflaeche f; Bezugsflaeche f; Bezugshoehe f; Bezugsniveau n; Niveauflaeche n
earth.sc., tech.	Referenzebene f
el.	Bezugsebene f
mech.eng.	Profilbezugsebene f
met.	Grundebene f
transp.	Bezugshorizont m; Horizontale n
transp., construct.	Horizont m
piano di riferimento per un corpo nello spazio
sat.comm.	Hauptbezugsebene eines Weltraumkörpers

piano di riferimento: 5 phrases in 3 subjects

Communications	1
Magnetics	1
Transport	3