roughing operation
51American literature — Introduction the body of written works produced in the English language in the United States. Like other national literatures, American literature was shaped by the history of the country that produced it. For almost a century and a… …
522011 Chinese pro-democracy protests — 2011 Chinese Protests A large crowd of protesters, journalists, police and spectators gathered in front of a McDonalds restaurant in Wangfujing, Beijing. Location …
53Nuclear reactor safety systems — This article covers the technical aspects of active nuclear safety systems. For a general approach to nuclear safety, see nuclear safety. The three primary objectives of nuclear reactor safety systems as defined by the Nuclear Regulatory… …
