3. State Grid Corp.
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| Photo taken on Feb. 28, 2011 shows a transformer site of the 660 kV DC power transmission line in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region. The world's first 660 kV DC power transmission line linking Ningxia with east China's Shandong Province was officially put into operation Monday. (Xinhua/Wang Peng) |
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