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Dear marine professionals, in order to help everyone learn the ProII process simulation software better – so that beginners can gain knowledge and experienced users can refresh their skills – we are launching the \"Make Progress Every Day\" series of courses on the basics of ProII. Since I use Aspen Plus/Hysys on a regular basis and have not studied ProII software systematically, the knowledge I offer might be quite basic. I hope fellow users will provide valuable suggestions and opinions, and actively participate in the discussions. Multiple-choice question: 4. Which of the following statements about the binary interaction parameter is correct? A. In many cases, phase equilibrium data are available, but the binary interaction parameter must be estimated using data fitting and parameter estimation techniques; simulation software such as ProⅡ and Aspen Plus have this capability. B. If the required data cannot be obtained through various means, only estimation methods remain. Simulation software such as ProⅡ and Aspen Plus can use the UNIFAC method to estimate the binary interaction parameters for the WILSON, NRTL, and UNIQUAC models, but the parameters obtained in this way have slightly poorer accuracy. It should also be noted that the applicability of the UNIFAC method is limited. C. The data collected or estimated shall comply with the rules of thermodynamic consistency and satisfy the universal laws of thermodynamics. D. For binary gas-liquid equilibrium data, thermal consistency checks can be performed using the following method. By plotting log(γ2/γ1) versus x, the resulting curve shows two regions with respect to the horizontal axis log(γ2/γ1)=0: S1 and S2. When ABS(S1-S2)/(S1 + S2) ≤ 0.02, it is considered to satisfy the thermodynamic consistency rule. E. Once the thermodynamic data and model parameters have been collected or estimated, the calculated values are compared with experimental values or values from literature using tables or graphs. If no available data exists, data from compounds with similar structures are used for testing. When multiple models are available, the one with better accuracy can be selected through comparison. Answer: ABCDE