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| English thesaurus | |||
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| optical-density units | |||
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| optical density units | |||
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| optical density units | |||
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od units : 31 phrases in 9 subjects |
| Agriculture | 2 |
| Automobiles | 3 |
| Business | 1 |
| Drilling | 1 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Metallurgy | 5 |
| Oil / petroleum | 2 |
| Pharmacology | 4 |
| Technology | 10 |
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