One Question per Day on Synthetic Ammonia – Multiple Choice 317 (Friday, 2011-12)

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This post was last edited by zhengrd on 2011-12-9 at 14:38. Multiple-choice questions: 1. The acceptable standard for fire hazard analysis is that for gases with a lower explosive limit of less than 4%, their concentration must not exceed ( ) (A) 0.5% (B) 0.2% (C) 0.7% (D) 1%. 2. In situations where there are asphyxiant gases inside towers or tanks, the oxygen concentration should reach ( ). (A) 19%–22% (B) 19%–20% (C) 18%–20% (D) 18%–19% The purpose of the “One Question per Day” activity on the basics of ammonia synthesis production is to review the knowledge we have already learned. By answering questions, participants can improve and strengthen their fundamental theoretical knowledge, recall what they have forgotten, discuss controversial points, and progress together. The top 50 answerers will definitely receive a reward. Those who simply state the reasons for their choice will be given additional points as appropriate! Please reply with the answer hidden; otherwise it will be invalid. To view the hidden method, go to: http://bbs.hcbbs.com/thread-492556-1-1.html. Please do not edit after replying. Answer 1B; 2A