| 1 | Mainly by tobacco bud extract petroleum ether extract obtained tobacco bud extract. | |
| 2 | Petroleum ether (30~60℃) is the optimum solvent for extracting apple seed oil. | |
| 3 | After a 9-day drug-sustaining culturing, the petroleum extraction of persimmon solution obtained weak drug resistance. | |
| 4 | The Divisionof Zimbabwe is mainly through petroleum ether extract of Zimbabwean tobacco extract obtained extract. | |
| 5 | TheVirginia Division of petroleum ether extract is mainly extracted by Virginia tobacco extract obtained. |
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