Qinghai-Tibet Power Grid to wire 'Roof of world'
11:05, July 12, 2011 
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A worker takes a picture of the high-tension cable. (Xinhua/Qi Zhengji)
The construction of Qinghai-Tibet Power Grid successfully surmounted the Tanggula Mountain section, its hardest obstacle, on July 10.
The average altitude along the lines is 4,500 meters above sea level, of which the highest place can reach to 5,300 meters. Due to harsh environmental conditions, such as low temperature, strong wind and lack of oxygen, carrying out the construction was arduous.
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（Editor：张洪宇）
Qinghai-Tibet Power Grid to wire 'Roof of world'
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http://english.people.com.cn/90001/90783/91300/7437023.pdf