【Daily Question】Chemical Engineering Principles 122: Equilibrium Lines (July 27)

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The Chemical Engineering Theory section is launching the \"One Question per Day\" campaign starting today, aimed at helping everyone reinforce their basic knowledge of chemical engineering. Subsequent series will include those on \"Principles of Chemical Engineering,\" \"Mass Transfer and Separation,\" \"Thermodynamics in Chemical Engineering,\" and \"Chemical Process Engineering.\" We hope for your active support! Answers to the questions in the \"One Question per Day\" campaign can be viewed directly by replying to the post, and the topic will be closed after 1 day ! Participation earns 2 wealth points, with an additional 3 wealth points for correct answers~~~ Fill-in-the-blank: The equilibrium line represents the ___________________ of the gas and liquid phases at any cross-section of the tower, while the operating line indicates the ______________ relationship between the concentrations of volatile components in the gas and liquid phases ； The operating line relationship between the composition of the vapor rising in the next tray within the tower and the composition of the liquid phase on the previous tray for the volatile components.