【Daily Question】Catalytic Cracking, Coking, and Reforming Version 20170116
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This post was last edited by 103388716 on 2017-1-16 at 10:23. To increase the popularity of this section, a daily quiz activity has been launched; the purpose of this activity is: “Learn a little bit every day, and make significant progress over ten days.” I hope everyone will participate actively; by learning and making progress, they can also easily bring wealth home :) Participation: 3 rewards for wealth ； Correct answer: Reward of 8 wealth points ； Note: For questions from the same day, full feedback will be given if answered on the same day; answering the next day earns 3-5 wealth points as a reward. http://bbs.hcbbs.com/static/image/hrline/4.gif Fill-in-the-blank question (Catalysis section): When the control valve is subjected to signal pressure, the valve closes; when there is no signal pressure, the valve opens. What is this? Wind shut-off valve
A valve that closes when there is signal pressure and opens when there is no signal pressure is known as a wind-operated valve or air-operated valve. I looked at the wrong question