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± 400 KV AC-DC Network project in Qinghai and Tibet is one of the national key projects, it is located in the highest latitude in the world up to now, and the largest power transmission project. This project has the total line length of 1038 km, and passes through 565km of perennial frozen soil, where construction is a globally technical problem. Budongquan-Fenghuo Mountain frozen soil area is in...
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