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Why are there no PetroChina and Sinopec gas stations in Taijiu Expressway?

taijiu expressway, namely Taiyuan-jiuguan expressway. The sixth section (Pingding Jiuguan-Liulin Jundu) of Shanxi Expressway Network Planning is also an important part of the national G2 Qingyin Expressway. Such a high-grade kilometer should have a gas station built by China Petrochemical.