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Practice questions on April 6, 2017; replies will earn 2–6 points (**no scoring after it is displayed, thank you for your replies)

2017-04-06View Original

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Multiple-choice question: When starting the unit, if the vacuum level for reducing the dome pressure cannot be increased, one should ( ABC ). A. Strictly control the amount of crude oil. B. Increase the draw rate of the atmospheric distillation column. C. Control the temperature at the top of the vacuum distillation column. D. Lower the temperature at the outlet of the vacuum furnace

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