Shanghai Huatan Communication Technology Co., LTD., founded in 2008, has been engaged in the research and development of mobile intelligence education. Based on more than ten years of mobile learning practice, we have developed mobile intelligence learning system and smart desk through technological innovation with natural interaction as the core. PDF is often used in our courseware and notes. In the process of using PDF, we have encountered many problems that cannot be solved. We hope to get the technical support and help from PDF Association, and discuss and learn from each other, so that PDF can be widely used in the education industry and help more people improve their study and work efficiency.
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