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- chemical pollution 1
- chemical properties 3
- chemical suppression 2
- Chervonogradska coal mine 1
- children with disabilities 1
- chlorinated pesticides 1
- chromatography 2
- chrononym 2
- ciecze smarująco-chłodzące 1
- ciepło 1
- circular saw 1
- circular saw, transverse oscillations, ring plate, natural frequency, elastic fastening 1
- Cisco 1
- city 1
- civic competence 1
- Civil protection 1
- civil defence 1
- civil defense 1
- civil defense, fire-rescue departments 1
- Civil protection 2