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【Daily Question No. 223】2017.08.11 (True/False): When performing work to open the manhole in a packed tower, the workers usually have extensive experience and are familiar with the procedure for opening such manholes; therefore, there is no need to provide them with safety instructions. () Reply* to see the reference answers; scoring is awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The X daily challenge closes after 7 days, and the answers are displayed automatically. (2017-8-16) Scoring criteria: Errors result in 2 Wealth points for participation; *incomplete* answers earn 3–8 points. Correct answers with detailed explanations grant 10 Wealth points, while answers that are correct but lack sufficient details yield 15–20 Wealth points. Please use these criteria for scoring. Note: If there are editing records after answering, only those who participated will be given points. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters unrelated to the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Savings” campaign (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum Website)