【Daily Question】 2016 04 20 Hydrogenation Sector Multiple-choice Question

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【Daily Question】 April 20, 2016 – Hydrogenation section, multiple-choice question. It is generally considered acceptable if, after stopping vacuum extraction, the vacuum level in the reaction system decreases by no more than ( ) within 30 minutes. A. 500 pa B. 1000 pa C. 1500 pa D. 2000 pa. Promotion for petrochemical-related activities: Do you want to receive souvenirs such as Haichuan water cups? Then hurry up and participate in the large-scale event organized by our petrochemical region – “I’m Saving Energy, Where Are You?” For more details, visit http://bbs.hcbbs.com/thread-1579199-1-1.html. This event offers awards in both text and picture categories. When there are over 200 entries, an additional grand prize will be awarded: 600 Haichuan coins. If there are more than 300 entries, the grand prize amount increases to 1000 Haichuan coins; if there are 500 entries, it’s 1500 Haichuan coins. First prize: 3 Haichuan commemorative water cups. Second prize: 5 winners, each receiving 120 Haichuan coins. Honorable mentions: several winners, each receiving 200 Haichuan coins. 1. Information on contests with prizes for specific topics: http://bbs.hcbbs.com/thread-1568416-1-1.html (Source: Haichuan Chemical Forum). 2. [Petrochemical Weekly] Issue No. 9, dated 2016-3-12 (Summary of recent petrochemical activities): http://bbs.hcbbs.com/thread-1568615-1-1.html (Source: Haichuan Chemical Forum). 3. “Haichuan Gratitude Season” – Summary of events in the Petrochemical Section: http://bbs.hcbbs.com/thread-1533218-1-1.html (Source: Haichuan Chemical Forum). 4. Summary of professional “basic knowledge” posts in the Petrochemical Section (Supported by the main forum; amazing prizes await you): http://bbs.hcbbs.com/thread-1557057-1-1.html (Source: Haichuan Chemical Forum). Haichuan, threads, petrochemicals