One question per day, the correct answer will be rewarded with 6 wealth, and the participant will be rewarded with 2 wealth； December 08
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Multiple choice questions: The correct operation procedure for the following tube and tube heat exchanger is ( ). A. When starting the vehicle, the cold material should be introduced first and then the hot material. B. When the vehicle is stopped, the hot material should be stopped first and then the cold material. C. Non-condensable gas should be discharged when starting the vehicle. D. When pipe blockage or severe scaling occurs, the flow of cold and hot materials should be increased respectively to maintain the heat transfer rate. Answer: ABC
A. When starting the vehicle, cold materials should be introduced first and then the hot materials. B. When stopping the vehicle, the hot materials should be stopped first and then the cold materials. C. Non-condensable gas should be discharged when starting the vehicle.