山東省是這些企業最集中的地方，根源可追溯至1960年代「勝利油田」周邊興起的地方煉廠，起家於地方政府允許收集油田洩漏原油加工的政策，逐漸形成集聚，一度被業界稱為「世界第三大煉油中心」，約佔全國地煉總產能的70%至80%。
Still, when my plane’s turn came, the takeoff was as exhilarating as ever—the low rumble and rising thrum, the smooth detachment and sudden lift, and then the surge through clouds into a piercing blue sky. To fly is to be suspended in disbelief. Hurtling through thin air at subzero temperatures, thirty-five thousand feet above Earth, you have no choice but to trust that the atmosphere won’t kill you. That the giant machine you’ve boarded won’t fall apart. A Boeing 777 is pieced together from more than three million components, many of them essential to keeping it aloft. And the atmosphere has countless more moving parts. As the French aviation pioneer Pierre-Georges Latécoère put it, in 1918, “I’ve redone all the calculations, and they confirm what the experts say: It can’t work. There’s only one thing to do: Make it work.”
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