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material de base
agric.	basic material
mater.sc., met.	metal basis; base materials; substrate
pack.	raw material; element; substrate (para ser recubierto); supporting material (para ser recubierto); carrier (for being coated, para ser recubierto)
PCB	base material

material de base : 6 phrases in 3 subjects

Agriculture	2
Information technology	2
Printed circuit boards	2