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Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer). | |
A. | 250 [Wrong Answer] |
B. | 450 [Wrong Answer] |
C. | 650 [Correct Answer] |
D. | 750 [Wrong Answer] |