【Daily Question】Production, Storage, and Transportation - 20190616

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One question per day on the production, storage, and transportation version; 5 wealth points are awarded for correct answers； Effective participation grants 2 units of wealth ； Extra points will be given to those who provide a reasonable solution first. Multiple-choice question: There are two identical shell-and-tube heat exchangers that are to be used as gas coolers. When the gas and liquid flow rates as well as the inlet temperature are constant, the process that should be used to reduce the gas temperature to its lowest possible level is ( ) ； 　　(A) Gas flows outside the tube, with parallel counterflow operation of the gases. (B) Gas flows inside the tube, with parallel counterflow operation of the gases. (C) Gas flows inside the tube, with series counterflow operation of the gases. (D) Gas flows outside the tube, with series counterflow operation of the gases. (D) Gas flows outside the tube, with series counterflow operation of the gases