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第1题

In North American_ is adopted as standard frequency in electric power system.A.25HzB.50Hzc.60HzD, 125Hz
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第2题

In cogeneration (热电联产，热电联供 ) systems, the overall energy effincies are raised by_.A, important the combustion processB.
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第3题

In a coal-fired power plant, an electrostatic precipitator is used to remove__ from the combustion gases. A. solid par
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第4题

Delphi belongs to_ A. low-level programming languageB. high-level programming language c. a programming language co
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