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. The letters hs ht at aw in the road cross-section diagram mean the general road design diagram ht/hw: the height difference between the original ground elevation and the design elevation at the center line of the road. Excavation is represented by hw and filling is represented by ht.
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