One Question per Day on Synthetic Ammonia 291 Multiple Choice Question (Sunday, 11-13-2011)

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Multiple-choice question: Dear new users, learn how to use hide. 1. When sampling flammable gases that are denser than air, as they tend to accumulate at the bottom of the equipment, one sample should be taken from (). (A) in, (B) below, (C) in and below, (D) above. 2. The method to increase the convective heat transfer coefficient on the shell side of a heat exchanger is (). (A) Install baffle plates; (B) Increase the number of tubes in the tube side; (C) Increase the spacing between plates; (D) Decrease the spacing between plates. The purpose of the “One Question per Day” activity on the basics of ammonia production is to review the knowledge we have already learned, to improve and strengthen everyone’s fundamental theoretical knowledge through answering questions, to help people recall what they have forgotten, to deepen discussions on controversial topics, and to promote collective progress. 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 hide and view the method: http://bbs.hcbbs.com/thread-492556-1-1.html-. Please do not edit after replying. Answer: C A