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- operations 1
- operations with financial assets 1
- operative control 1
- opportunities of scientific communication 1
- optical properties 1
- optical tomography 1
- optimization of mechanical quencher 1
- oral and written communication 1
- oral skills 1
- oral speech 1
- oratory 1
- Organic production 1
- organismos estatales 1
- Organization 1
- organization 1
- organization of educational space 1
- Organizational and methodological conditions 1
- organizational structure 1
- Organizational-economic mechanism 1
- origin of idioms 1