Practice questions on June 14, 2017; replies will earn 0–6 points (no scoring for replies sent more than 1 day after posting). Thank you for your replies

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Multiple-choice question: (No points will be given for selecting too many or too few options) When operating the distillation tower, pay attention to the following points; the correct answers are (ABCD). A The flow pattern at the top of the tower must follow that of normal operation, and no condensing coolers should be omitted. B: Open the vent at the manhole of the oil-water separator at the top of the tower, and open all the drain bypass valves. C: All the side stream extraction valves as well as the extraction valves of the stripping tower must be closed to prevent steam from entering the side streams. But the valve connecting the main tower to the stripping tower must be opened. All the stripping towers connected to the main tower must be distilled together according to the process, and the bottoms of these stripping towers should be vented. The vent valve of the E tower bottom level gauge is closed. No rating will be given for replies within 1 day of posting; thanks for your reply