【Daily Question: Pump Equipment】Multiple-choice Question, May 28, 2019

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This post was last edited by 3983596_FPPZ on 2019-5-28 at 10:57. Rules for answering questions and managing the post: 1. If all answers to a question are incorrect, participants who engage actively will receive 2 units of wealth as a reward; replies that are not answers will not be rewarded； 2. In the answer section, a correct answer earns 5 wealth points ； A reward of 8 wealth for all correct answers ； 3. Rewards for answers are available once per person only ； 4. Each reply allows for only one management rating ； 5. The answer and explanation will be visible after responding ； 6. The reply reward is valid for 48 hours. The student has won another award; come by here every day. For pipeline transportation of a certain medium, the required average flow velocity is between 2.5–5.5 m/s, the flow rate is 300 tons per hour, and the specific gravity of the medium is 0.9. What are the available standard pipe diameters for selection? ( ) ； A 100mm B 125mm C 150mm D 200mm E 250mm Answer: C D