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【Daily Question】 April 19, 2016 – Hydrogenation section, multiple-choice question: The raw material filter is used to prevent （ ） from entering the reactor. A. Alkaline nitrogen B. Aromatic hydrocarbons with fused rings C. Mechanical impurities D. Dissolved iron. Promotion of petrochemical-related activities: Notice regarding the large-scale event “I’m saving energy; where are you?” in the petrochemical area: http://bbs.hcbbs.com/thread-1579199-1-1.html. This event offers awards in both textual and photographic categories. When there are over 200 entries, an additional grand prize will be awarded, worth 600 Haichuan coins; if there are more than 300 entries, the grand prize value increases to 1,000 Haichuan coins, and if there are 500 entries, it rises to 1,500 Haichuan coins. First prize: 3 Haichuan commemorative water cups; second prize: 5 winners, each receiving 120 Haichuan coins; excellence awards: several winners, each receiving 200 wealth points. 1. Information on contests with prizes for specific topic categories: http://bbs.hcbbs.com/thread-1568416-1-1.html (Source: Haichuan Chemical Industry 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 Industry Forum). 3. “Haichuan Gratitude Season” – Summary of events in the Petrochemical Section: http://bbs.hcbbs.com/thread-1533218-1-1.html (Source: Haichuan Chemical Industry 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 Industry Forum)