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| permeability apparatus; permeability meter | |||
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透 气计 : 12 phrases in 8 subjects |
| Chemistry | 1 |
| General | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 1 |
| Plastics | 1 |
| Polymers | 2 |
| Technology | 4 |
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