One Question per Day on Refining Knowledge (Technology) 110218

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We welcome everyone to actively participate in the learning and discussion of professional basic knowledge in the refining technology exchange area! In accordance with the forum’s uniform requirements, the maximum score for this event is 5 Wealth points, and it is prohibited to assign charm scores. Friendships and duplicate ratings are also declined. Be cautious when posting; editing is ineffective. Those who have different opinions on the provided answer keys can post discussions the next day; those who provide solutions or their own opinions regarding the answer to the daily question will receive appropriate rewards! The key is to participate; there are prizes for participation. 1. What must be started using a pump at the beginning is ＿＿＿＿. A. Reciprocating pump B. Centrifugal pump C. Rotary pump 2. From bottom to top along the feed section, the temperature at various points in the tower is ＿＿. A. Decrease B. Increase C. Remain unchanged 3. The properties of reprocessed oil are ( ). A. The same B. Different 4. Corrosion in areas exposed to high-temperature heavy oil is mainly caused by ( ) in crude oil. A. Salt content B. Sulfur content C. Acid content 5. The open flash point is generally ＿＿ than the closed flash point temperature. A. High B. Low C. Equal Answer: B ； A ； B ； B ； A