[Phase 1 of Time-Limited Quick Response Contest] 004 [Completed]

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Rules: 1. If you want to answer immediately, give a score of +1 wealth to floor 1 and write your answer in the “Reason for action” field (only the content within parentheses); see the diagram below for details. 2. “*” represents a Chinese character or a digit, and the answer must match exactly to be considered correct. 3. The first person to answer correctly will receive +10 wealth points; please reply in the comments on floor 2 or below to claim the reward ； 4. The scope of questions covers the commonly used standards and experience manuals in the fields of process engineering and piping ； 5. The difficulty level of the questions increases from easy to difficult. 6. Lower-grade students are welcome to participate actively. Question for this issue: 004. Rotameters must be installed vertically; to ensure measurement accuracy, there should be a 5D straight pipe section in front of the meter during installation, but this length should not be less than (***) mm. Standard answer: 300. Winner: wine2009. This post was last edited by hutom123 on 2009-3-25 09:24.]