One Question per Day on Synthetic Ammonia (Series 59)

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I. Multiple-choice questions (Each question has 4 options, of which only 1 is correct; fill in the correct option in the brackets) Continuing from Series 58, 136: The common connection methods for chemical engineering pipelines are (). A. Threaded connection B. Flanged connection C. Bearing connection and welding D. All of ABC 137. **Backward processes and equipment that cause severe pollution of water environments should be （）. A. Deadline-based phase-out system B. Usage control system C. Double fines D. Use after renovation 138. What extinguishing agent is required in case of a fire involving sodium or potassium metal? A. Sand B. Water C. Foam fire extinguisher D. Liquid carbon dioxide fire extinguisher 139. Among the main evaluation criteria for solid catalysts, the first thing to consider is (). A. Activity, B. Selectivity, C. Lifespan, D. Stability. 140. The requirements for solid catalysts in industrial production are (). A. To achieve a higher conversion rate for the reaction B. To have better selectivity C. To increase the equilibrium conversion rate D. The activation temperature needs to be high. Answer: D. AAAAB Scoring criteria: 3 points for participation, 1 point added for each correct answer