investigation : 25 phrases in 13 subjects |
Education | 1 |
Electric traction | 1 |
Fish farming pisciculture | 1 |
General | 7 |
Law | 7 |
Life sciences | 1 |
Medical | 1 |
Nuclear and fusion power | 1 |
Pharmacy and pharmacology | 1 |
Politics | 1 |
Social science | 1 |
Transport | 1 |
United Nations | 1 |