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September 18, at the northern end of Tiananmen Square Monument to the People's Heroes 2 groups on both sides of the first set of wide, high-definition LED electronic display began test broadcasts on the night of the "National Day" exercise in the air.
These two sets of high-tech screen 50 meters wide, 7.5 meters high, a point spacing of 16 mm full-color LED pixels, is by far the world's Square LED display the most.
