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| 公开/私有: | 公开 私有 |
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| 公开/私有: | 公开 私有 |
- petroleum industry and trade (17)
- 石油工业 (6)
- government policy (5)
- petroleum (5)
- equipment and supplies (4)
- history (4)
- political aspects (4)
- gas industry (3)
- petroleum engineering (3)
- petroleum products (3)
- petroleum reserves (3)
- prices (3)
- prospecting (3)
- united states (3)
- 研究报告 (3)
- corrosion (2)
- corrosion and anti-corrosives (2)
- diplomatic relations (2)
- economic aspects (2)
- energy policy (2)
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