One Question per Day on Synthetic Ammonia (Series 55)

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This post was last edited by 654262293 on 2016-3-28 at 14:33. 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 fifty-four: 116. An increase in the CO content in the fresh gas results in a change in the temperature of the catalyst layer in the synthesis tower ( ). A、Increase B、Decrease C、Unchanged D、Irrelevant. 117、Which of the following is not an indicator for measuring the quality of a catalyst? () A. Selectivity B. Shape C. Service life D. Activity 118. The safety devices used to release pressure from pressure vessels in chemical enterprises include safety valves and (). A. Steam trap B. Check valve C. Explosion-proof membrane D. Throttle valve 119. Which of the following substances cannot be used to extinguish fires involving organic solvents such as gasoline? () A. Sand B. Water C. Carbon dioxide D. Carbon tetrachloride 120. A catalyst with good performance should have a relatively large (). A. Surface area B. Volume C. Specific surface area D. Density Answer: BBCBC Scoring criteria: 3 points for participation, 1 point for each correct answer