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Chinese Vice Premier Ma Kai looks at charging equipments during his inspection on the development of new energy vehicle industry in Beijing, capital of China, July 4, 2017. (Xinhua/Pang Xinglei)

Chinese Vice Premier Ma Kai looks at charging equipments during his inspection on the development of new energy vehicle industry in Beijing, capital of China, July 4, 2017. (Xinhua/Pang Xinglei)