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本帖最后由 细胞海洋 于 2014-7-1 09:56 编辑
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COVER Natural gas extracted from a deep shale formation by hydraulic fracturing ("fracking") technology burns at a well in Bradford County, Pennsylvania. Fracking is enabling a shale gas production boom, remaking energy markets, and stoking environmental concerns. See page 1464.
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发表于 2014-6-30 21:42
