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actividad superficial |
area activity: 19 phrases in 11 subjects |
Economy | 3 |
Education | 1 |
Labor law | 1 |
Law | 1 |
Marketing | 1 |
Materials science | 1 |
Mineral products | 1 |
Name of organization | 1 |
Natural sciences | 1 |
Research and development | 2 |
United Nations | 6 |