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BEIJING--The concrete roof of a school gymnasium collapsed in China’s Qiqihar city ... a mineral with high water content and which can absorb water, on the roof of the gymnasium during ...
BEIJING, July 24 (Reuters) - The concrete roof of a school gymnasium collapsed in China's Qiqihar city on ... a mineral with high water content and which can absorb water, on the roof of the ...
BEIJING, July 24 (Reuters) - The concrete roof of a school gymnasium collapsed in China's Qiqihar city ... a mineral with high water content and which can absorb water, on the roof of the ...
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