[Q&A] Catalytic Coking Reformate Blending Edition 20171218

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Participation: Reward of 3~5 wealth points； Correct answer: Reward of 10 wealth points ； Note: This post is valid for 48 hours. Question: How many types are there for the classification of projection methods? Answer: It can be divided into central projection and parallel projection, with parallel projection further divided into orthographic projection and oblique projection. Your participation is the greatest support for our work. Giving roses to others leaves a pleasant fragrance in one’s own hands. https://bbs.hcbbs.com/static/image/hrline/1.gif https://bbs.hcbbs.com/static/image/hrline/2.gif The answers will be announced automatically after two days. “My Device, My Home” – Large-scale Original Photo Sharing Contest (Second Edition) https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1868167&extra=page%3D1 【Daily Question】Summary Post for 2017 on Catalyst Coking and Reforming Oil Blending https://bbs.hcbbs.com/thread-1811219-1-1.html 【Q&A】Summary Post for 2017 on Catalyst Coking and Reforming Oil Blending https://bbs.hcbbs.com/thread-1826018-1-1.html