【Purification Daily Question】June 16, 2016

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To increase the popularity of the purified area, a \"One Question per Day\" campaign was launched to foster an active atmosphere for technical exchanges while offering members certain financial rewards. (Fellow sea lovers, if you have any good questions, feel free to send them to me; let’s work together.) 【Daily Question】 Which of the following statements about newly built installations is correct? (　　) A. The purpose of purging is to replace the contents in the pipelines. B. The equipment is purged before hydrostatic testing. C. Both the main pipes and branch pipes are purged together. D. A test piece (such as a polished aluminum plate or copper sheet) is fixed at a 45-degree angle at the pipe outlet to determine its cleanliness; it is considered acceptable if there are no defects on it. Please reply with your answer; participating in the quiz earns you +2 wealth points. Those who get all answers correct will receive an additional +3 to +8 wealth points. Those who provide thorough analyses and explanations for the questions or answers, including detailed calculation processes, will receive extra wealth points as a reward. If your answer is correct and your analysis is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions. D