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reference plane
earth.sc., mech.eng.	superficie de nivel
el.	plano de referencia
principal reference plane for a body in space
sat.comm.	plano fundamental de referencia para un cuerpo en el espacio; plano principal de referencia para un cuerpo en el espacio

reference plane: 10 phrases in 5 subjects

Communications	2
Magnetics	2
Medical	2
Technology	2
Transport	2