One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； October 28th
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Multiple-choice question: In the calcium carbide process for the distillation of vinyl chloride monomer, in order to maintain material balance within the low-boiling tower, the sum of the amount of vapor leaving the top of the tower and the amount of vapor leaving the bottom of the tower is essentially equal to the amount of material within the tower. A: Liquid phase ； gas phase ； Feedstock ； B: Gas phase ； liquid phase ； Discharge ； C: Gas phase ； liquid phase ； Feedstock ； D: Liquid phase ； gas phase ； Discharge ； Answer: A: Liquid phase ； gas phase ； Feedstock ；
A: Liquid phase； gas phase ； Feedstock ；