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