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показатель цвета U-В
stresses
astr.
ultraviolet minus blue colour index
;
U-B
colour index
показатель цвета В-V
astr.
blue minus yellow colour index
;
B-V
colour index
показатель цвета U-В:
4 phrases
in 3 subjects
Astronomy
2
Information technology
1
Polymers
1
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