extr - fill
- extra-heavy oil
- extract
- extract selectively
- extractant
- extraction
- extraction column
- extraction rate
- extraction solution
- extraction valve
- extraction vessel
- extractive distillation
- extractive properties
- extractive rectification
- extractor
- extractor duty
- extractor load
- extrapolation
- extreme continental climate
- extreme line casing
- extrinsic current
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