crank balanced beam pumping unit jidong oilfield sunset scenery closeup photo |
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| navigate by keyword : 039 background balance beam beautiful china circulation clouds color crank crust earth energy environment equipment evening exploration features geology industrial jidong landscape light machinery mining nature oilfield orange outdoor outline petroleum pumping resources setting silhouette space spin strata sun traction underground unit |
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| Crank balanced beam pumping unit in Jidong oilfield sunset scenery, Hebei Province, China |
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