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| pyrophosphoric ester ([RO(HO)PO]2O) | |||
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焦 磷酸 酯 : 20 phrases in 7 subjects |
| Agriculture | 1 |
| Chemistry | 3 |
| General | 5 |
| Metallurgy | 3 |
| Pharmacology | 6 |
| Technology | 1 |
| United Nations | 1 |
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