The rig explosion occurred about 20 hours after Halliburton finished its cement job, but the company says its workers tested it and everything looked fine.

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In little more than a decade, the country has become by far the biggest producer in the world of every industrial commodity from steel to glass to cement, and the finished products it exports to other countries are gradually matching and surpassing the sophistication of items produced indigenously in those countries.

FORBES: Inside Pentagon, Growing Alarm Over China's Military Prowess