One Question per Day on Synthetic Ammonia 182 (20/7-2011)

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True or False: 1. Reciprocating pumps and gear pumps belong to positive displacement pumps. 2. The mechanical seal consists of two smoothly fitted metal annular surfaces; one rotates with the shaft, while the other is fixed to the pump casing. The \"One Question per Day on Basic Knowledge of Ammonia Synthesis Production\" series comes from the intermediate-level test bank for ammonia synthesis operators. We encourage all participants to get involved actively. The purpose of this activity is to review the knowledge we have already learned, to improve and strengthen everyone’s fundamental theoretical understanding through answering questions, to help people recall what they have forgotten, to discuss controversial topics further, and to progress together. The top 50 answerers will definitely receive a reward. 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: 1: × Correct: Reciprocating pumps and gear pumps belong to positive displacement pumps. 2: √