【Weekly Question】Participate from 6/19/2017 to 6/25/2017 for +2 wealth； +3 to +10 wealth for correct answers

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To increase the popularity of the chemical analysis section, a \"Question of the Week\" campaign has been launched to foster an active atmosphere for technical exchanges while providing rewards in the form of financial benefits to users. 【Weekly Question】Multiple-choice question: Which of the following statements about pressure relief valves is correct? ( ) A. The low-pressure chamber is always in communication with the outside atmosphere; when its reading is zero, it indicates that the absolute pressure inside the low-pressure chamber is zero. B. When the pressure reducing valve is not connected to a high-pressure gas cylinder, its high-pressure chamber is not in contact with the atmosphere. C. The safety device on the pressure reducing valve ensures that the pressure at the outlet of the low-pressure chamber is lower than the pressure inside that chamber. D. The pressure inside the high-pressure chamber is always the same as the pressure of the container to which it is connected. Answer: D. Post your answer in a reply to this message; participating in answering earns +2 points, and getting all answers correct adds another +3 to +8 points. Those who provide a thorough analysis or explanation of the questions or answers (or include detailed calculation processes) will receive additional points as a reward. If your answer is correct and your analysis/explanation is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions.