What do y, t, k, ., u, x, n, r in airplane cabins mean? The prices are different, are they different seats? The meaning of the aircraft class code: Class F is the published price of first class, Class A is free of discounts for first class and frequent flyers, and Class C is public. Zhihu, a high-quality Q&A community on the Chinese Internet and an original content platform where creators gather, was officially launched in January 2011 with the brand mission of "allowing people to better share knowledge, experience and insights, and find their own answers." Zhihu relies on seriousness and professionalism.
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