One Question per Day on Synthetic Ammonia 355 (Tuesday, 1/17/2012)

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Multiple-choice question: 1. Pressure vessel heads do not include ( ) heads. (A) Convex (B) Conical (C) Flat (D) Concave 2. The advantage of a spring-loaded safety valve is ( ). (A) Not portable (B) Not airtight (C) High sensitivity (D) Low sensitivity. The purpose of the “One Question per Day on Basic Knowledge of Ammonia Production” activity is to review the knowledge we have already learned, to improve and strengthen everyone’s fundamental theoretical knowledge as they answer questions, to help them remember what they know, to restore memories that have been forgotten, and to foster further discussion on controversial topics, thereby enabling all of us to make 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, please visit: http://bbs.hcbbs.com/thread-492556-1-1.html. Please do not edit after replying. Answer D C