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- ecological balance 1
- ecological consciousness 1
- ecological culture 1
- ecological education 1
- ecological equilibrium 1
- ecological factors 1
- ecological index 1
- ecological knowledge 1
- ecological perception 1
- ecological risk factors 1
- ecological thinking 1
- ecologie 5
- ecologie agrară 1
- ecology 4
- economia educaţiei 1
- economia firmei 1
- economia Moldovei 2
- economia Republicii Moldova 1
- economic 2
- economic advantage 1