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24th Int'l Oil, Gas, Refining & Petrochemical Exhibition held in Tehran, Iran

Source：Xinhua| 2019-05-02 13:33:32|Editor: Shi Yinglun

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People visit the 24th International Oil, Gas, Refining & Petrochemical Exhibition in Tehran, Iran, on May 1, 2019. (Xinhua/Ahmad Halabisaz)

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