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| 丁基橡胶 (rubber) | |||
| 异丁烯橡胶 | |||
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isobutylene-isoprene : 16 phrases in 7 subjects |
| Automobiles | 1 |
| Chemistry | 4 |
| Oil / petroleum | 2 |
| Plastics | 2 |
| Polymers | 3 |
| Technology | 3 |
| Water resources | 1 |
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