理解知识，踏实成长。
知序是面向 CSCA 理科备考学习者的个人经营学习网站，提供数学、物理、化学的视频课程与练习工具。课程用于日常学习与复习，练习用于检查理解和整理错题。
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About Zhixu
Zhixu is an individually operated learning website for CSCA science preparation. It provides mathematics, physics and chemistry video courses alongside practice and revision tools. Browse the course catalogue or visit practice and exams. Some features require an enrolled email address or course access.
We are an independent learning service, not an official examination or admissions body. We do not guarantee admission, visas, scores or examination outcomes. Refer to the relevant official institutions for current examination and application requirements.
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For course access, purchases, corrections, technical support or privacy requests, email xiaoning5353@163.com. Include the course or page and a description of the issue. Never send passwords or verification codes.
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